cam stroke vs instroke

cam stroke and instroke both are nouns.

Word	Noun	Adjective	Verb	Adverb
cam stroke	Yes	No	No	No
instroke	Yes	No	No	No

As nouns, instroke is a hyponym of cam stroke; that is, instroke is a word with a more specific, narrower meaning than cam stroke:

cam stroke: the maximum movement available to a pivoted or reciprocating piece by a cam
instroke: the stroke of an engine piston moving away from the crankshaft

Other hyponyms of cam stroke include outstroke.

cam stroke (noun)	instroke (noun)
the maximum movement available to a pivoted or reciprocating piece by a cam	the stroke of an engine piston moving away from the crankshaft