Pronunciation guide: IPA symbols, stress and word endings

θ	thin	ð	this	ʃ	she	ʒ	measure
tʃ	church	dʒ	judge	ŋ	sing	j	yes

p b t d k g f v s z h m n l r w sound as in ordinary English spelling.

ˈ main stress, before the stressed syllable: /ˈwɔːtə/ water · ˌ lighter (secondary) stress: /ˌʌndəˈstænd/ understand
ː a long vowel · (r) an r said only in accents that pronounce it (most American, Scottish, Irish)

-s / -es (plurals; he/she form of verbs): /s/ after voiceless sounds (cats), /z/ after voiced (dogs), /ɪz/ after s, z, sh, ch, j sounds (buses, watches). Spelling: -es after s, x, z, ch, sh; consonant + y → -ies (city → cities).
-ed (past): /t/ after voiceless sounds (walked), /d/ after voiced (played), /ɪd/ after t or d (wanted). Spelling: love → loved, stop → stopped, carry → carried.
-ing: make → making, run → running, see → seeing.
Irregular: go, went, gone · be, was, been · see, saw, seen · man → men · child → children · mouse → mice.
Older (King James) forms: -eth = -s (he loveth = he loves) · -est with “thou” (thou lovest) · spake = spoke.

professional

/pɹəˈfɛʃ.ə.nəl/ noun, adjective

Forms professionals

noun A person who belongs to a profession.
noun A white-collar worker, especially one with a specialized, high-earning job such as a doctor or engineer.
noun A person who earns their living from a specified activity.
noun (euphemistic) A prostitute. “There was this nice lady who flirted with me at the bar, but it turned out that she was a professional.”
noun A reputation known by name.
noun An expert.
noun One of four categories of sociologist propounded by Horowitz: a sociologist who is actively concerned with promoting the profession of sociology.
adjective Of, pertaining to, or in accordance with the (usually high) standards of a profession. “The doctor is very professional in his manner.”
adjective (by extension) Expert.
adjective Of an occupation, paid, especially so as to provide a livelihood. “a professional musician, a professional footballer”
adjective (often pejorative) Engaging in persistent behaviour that is exaggeratedly implied to be a full-time, paid occupation. “Don't listen to him, he's a professional bullshitter.”

Synonyms

From Middle English professhennalle, professhynalle; equivalent to profession + -al.

adjective Of or pertaining to a profession, or calling; conforming to the rules or standards of a profession; following a profession; as, professional knowledge; professional conduct. "Pride, not personal, but professional." Macaulay. "A professional sneerer." De Quincey.
adjective Engaged in by professionals; as, a professional race; --opposed to amateur.
noun A person who prosecutes anything professionally, or for a livelihood, and not in the character of an amateur; a professional worker.

Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “professional”, CC BY-SA 4.0. Details

Sanskrit dictionary entries whose meaning includes “professional” (best matches first).

गेष्ण geṣṇa a singer, a professional singer, an actor, a mime, a chanter of the Sāma-veda.
गिष्णु giṣṇu a professional singer; a Brāhman versed in the Sāma-veda, a chanter of that Veda; an actor.
कथक kathaka a narrator, a relater, one who recites a story or who publicly reads and expounds the Purāṇas etc., one who …
मङ्गलादेशवृत्त maṅgalādeśa-vṛtta a fortuneteller, professional panegyrist or well-wisher.
मङ्गलपाठक maṅgala-pāṭhaka ‘blessing-reciter,’ a professional well-wisher or panegyrist, a bard, encomiast.
भोगावली bhogāvalī an encomiastic poem, the panegyric of professional encomiasts or bards, eulogium.