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.

“obstacles” is a form of

obstacle

UK /ˈɒbstəkəl/ · US /ˈɑbstəkəl/ noun

Forms obstacles

noun Something that impedes, stands in the way of, or holds up progress, either physically or figuratively “A big obstacle to understanding the manual was that it had been poorly translated from the Japanese.”

Synonyms

From Middle English obstacle, from Old French obstacle, from Latin obstāculum.

Etymology [F., fr. L. obstaculum, fr. obstare to withstand, oppose; ob (see Ob-) + stare to stand. See Stand. and cf. Oust, v.]

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

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

प्रत्यूह praty-ūha an obstacle, impediment.
अविघात a-vighāta unimpended, having no obstacle.
अवग्रहण ava-grahaṇa obstacle, impediment, restraint, disrespect.
अन्तराय antar-āya going between; ( as ), m. intervention, obstacle, impediment.
स्तिभि stibhi an obstacle, obstruction; the ocean; a cluster, clump, bunch.
प्रतिष्टम्भ prati-ṣṭambha obstruction, impediment, obstacle, opposition, resistance, hinderance.
सार्गल sārgala having a bar or obstacle, barred, impeded, prevented, (Raghu-v. I. 79.)
निष्प्रत्यूह niṣ-pratyūha unobstructed, unimpeded, irremediable; ( am ), ind. without hindrance or obstacle, freely.