trainer vs Link trainer

trainer and Link trainer both are nouns.

Word	Noun	Adjective	Verb	Adverb
trainer	Yes	No	No	No
Link trainer	Yes	No	No	No

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

trainer: simulator consisting of a machine on the ground that simulates the conditions of flying a plane
Link trainer: an early form of flight simulator

trainer (noun)	Link trainer (noun)
simulator consisting of a machine on the ground that simulates the conditions of flying a plane	an early form of flight simulator
one who trains other persons or animals