collapse vs heatstroke

collapse and heatstroke both are nouns.

Word	Noun	Adjective	Verb	Adverb
collapse	Yes	No	Yes	No
heatstroke	Yes	No	No	No

As nouns, heatstroke is a hyponym of collapse; that is, heatstroke is a word with a more specific, narrower meaning than collapse:

Other hyponyms of collapse include breakdown, crack-up, shock, heat hyperpyrexia, algidity.

collapse (noun)	heatstroke (noun)
the act of throwing yourself down; collapse; sink	collapse caused by exposure to excessive heat
a natural event caused by something suddenly falling down or caving in
a sudden large decline of business or the prices of stocks (especially one that causes additional failures)
an abrupt failure of function or complete physical exhaustion

collapse (verb)	heatstroke (verb)
collapse due to fatigue, an illness, or a sudden attack
lose significance, effectiveness, or value
suffer a nervous breakdown
break down, literally or metaphorically
fold or close up
fall apart
cause to burst