wrench vs sprain

wrench and sprain both are nouns.

Word	Noun	Adjective	Verb	Adverb
wrench	Yes	No	Yes	No
sprain	Yes	No	Yes	No

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

wrench: a sharp strain on muscles or ligaments
sprain: a painful injury to a joint caused by a sudden wrenching of its ligaments

As verbs, wrench and sprain are synonyms defined as:

Other synonyms of wrench include rick, turn, twist, wrick.

wrench (noun)	sprain (noun)
a hand tool that is used to hold or twist a nut or bolt	a painful injury to a joint caused by a sudden wrenching of its ligaments
a jerky pulling movement
a sharp strain on muscles or ligaments

wrench (verb)	sprain (verb)
twist suddenly so as to sprain	twist suddenly so as to sprain
twist or pull violently or suddenly, especially so as to remove (something) from that to which it is attached or from where it originates
twist and compress, as if in pain or anguish
make a sudden twisting motion