woodscrew vs lag bolt

woodscrew and lag bolt both are nouns.

Word	Noun	Adjective	Verb	Adverb
woodscrew	Yes	No	No	No
lag bolt	Yes	No	No	No

As nouns, lag bolt is a hyponym of woodscrew; that is, lag bolt is a word with a more specific, narrower meaning than woodscrew:

woodscrew: a metal screw that tapers to a point so that it can be driven into wood with a screwdriver
lag bolt: a heavy woodscrew with a square or hexagonal head that is driven in with a wrench

Other hyponyms of woodscrew include lag screw, screw eye.

woodscrew (noun)	lag bolt (noun)
a metal screw that tapers to a point so that it can be driven into wood with a screwdriver	a heavy woodscrew with a square or hexagonal head that is driven in with a wrench