รุกขมูล | rookH khaL muunM | noun, phrase, poetic, loanword, Pali | the base of a tree |
| รุกคืบ | rookH kheuupF | verb | to advance; move forward; invade |
| รุกฆาต | rookH khaatF | verb, intransitive | a [certain type of] checking move in the game of chess |
| รุกจน | rookH johnM | verb, transitive | to checkmate |
| รุกร้น | rookH rohnH | verb, intransitive | to hurry |
| รุกราน | rookH raanM | verb | to trespass; invade; aggress |
| noun | [การรุกราน] aggression |
 รุ่ง  | roongF | noun | dawn; daybreak |
| verb | to dawn |
| noun | [ดาวรุ่ง] the morning "star," Venus; [fig.] a rising star, a person who is becoming prosperous |
| prefix | [prefix] |
| รุ้ง | roongH | noun | rainbow; spectrum of colors |
| adjective | wide and curved |
| รุ่งขึ้น | roongF kheunF | noun | dawn |
| รุ่งเช้า | roongF chaaoH | adverb | daybreak |
| รุงรัง | roongM rangM | attributive verb | [is] messy; unkempt; untidy; disordered |
| attributive verb | (of fur or hair) [is] bushy; shaggy; thick |
| noun | [รกรุงรัง] clutter; disorder |
| รุ่งเรือง | roongF reuuangM | verb, intransitive | to flourish; to prosper; to thrive; to succeed |
| รุ่งโรจน์ | roongF roht[n]F | verb, intransitive | [same as รุ่งเรือง] |
| รุด | rootH | verb | to hurry; to go hastily; to rush on; to proceed in a hurry |
| adjective | hurried; rapid |
| รุดหน้า | rootH naaF | verb | to hurry ahead; to push forward; to move ahead |
| รุทธาราม | rootH thaaM raamM | noun, proper noun, formal, loanword, Pali | Rutharam |
| รุท้อง | rooH thaawngH | verb | to take a laxative |
| รุน | roonM | verb | to push upon; exert force against |
| รุ่น | roonF | adjective | adolescent; young |
| noun | generation; era |
| noun, formal | model (auto model); [formal term officially endorsed by the Royal Institute] version (of software) |
| รุ่นเก่า | roonF gaoL | adjective | the older generation |
| รุ่นพี่ | roonF pheeF | noun | senior citizen |
| รุ่นยาย | roonF yaayM | noun | the older generation |
| รุนแรง | roonM raaengM | attributive verb | [is] forceful; harsh; violent; severe; strong; radical; extreme |
| รุ่นใหม่ | roonF maiL | noun | new model (of a product) |
| รุบรู่ | roopH ruuF | adjective | indistinct; dimly lit; murky |
| รุบหรู่ | roopH ruuL | | [alternate spelling of รุบรู่] |
| รุม | roomM | adjective, verb | beset; crowd; swarm; throng; congregate; flock; mob; besiege |
| รุ่ม | roomF | adjective | tepid; warm; lukewarm |
| adverb | many; very |
| verb | to beat (upon); to strike repeatedly |
| รุ่มรวย | roomF ruayM | adjective | very rich; wealthy |
| รุ่มร้อน | roomF raawnH | adjective | [of a person's appearance] awkward; out-of-style; square; not hip; uncool |
| รุมเร้า | roomM raaoH | verb | to beset; harass; trouble |
| รุสเซีย | rootH siiaM | | [alternate spelling of รัสเซีย] |
| รู | ruuM | noun | tiny hole; cavity; gap |
| classifier | [numerical classifier for tiny holes] |
| รู้ | ruuH | verb, intransitive, colloquial | to know a subject or piece of learned information |
| verb, phrase, colloquial | [ไม่รู้] does not know; did not know; don't know; to be uninformed |
| verb | [จะรู้] will know |
| verb | [ต้องรู้] must know |
| verb | [ควรรู้] should know |
| verb | [เพิ่งรู้] (has, have) just learned |
| verb | [คงจะรู้] probably will know |
| noun | [ความรู้] knowledge; information |
| verb | [จะต้องรู้] will have to know |
| verb | [ยังไม่รู้] still doesn't/don't know |
| verb | [ยังรู้] still knows; could yet know; can still know |
| รูกระดุม | ruuM graL doomM | noun | button hole |
| รู้กว้าง | ruuH gwaangF | | expert in ; be skilled; be well-versed; be proficient |
| รู้กัน | ruuH ganM | verb | understand each other; conspire; connive; encourage; be an accomplice or accessory |
| รูขุมขน | ruuM khoomR khohnR | noun | pore (of the skin) |
| รู้เขารู้เรา | ruuH khaoR ruuH raoM | example sentence, idiom | "To recognize others' emotions (e.g. your spouse)." |
| รู้เขารู้เรา รบร้อยครั้งไม่มีพ่าย | ruuH khaoR ruuH raoM rohpH raawyH khrangH maiF meeM phaayF | example sentence, idiom | "Use your wisdom and skills (i.e. not strength) to study and conquer the enemy, and the victory will always be yours." |
| รู้ความ | ruuH khwaamM | verb | understand; realize; learn |
| รู้คุณค่า | ruuH khoonM khaaF | verb | to know or appreciate the value of something |
| รู้งูๆปลาๆ | ruuH nguuM nguuM bplaaM bplaaM | example sentence, idiom | "A jack of all trades, master of none." |
| รูจมูก | ruuM jaL muukL | noun | nostril |
| รู้จัก | ruuH jakL | verb | [of a person or place] to know |
| รู้จักกันดี | ruuH jakL ganM deeM | adjective, verb, phrase | well known (known by many) |
| รู้จักกันทั่วไป | ruuH jakL ganM thuaaF bpaiM | adjective | commonly known; widely known |
| รู้จักมักคุ้น | ruuH jakL makH khoonH | attributive verb | [is] acquainted with; know someone well; [is] familiar with |
| รู้จักมักจี่ | ruuH jakL makH jeeL | attributive verb | [is] familiar with; [is] acquainted with; know (somebody) well |
| รูด | ruutF | verb | to slip; to slide smoothly; to pull; to draw |
| noun | rouge |
