smart bomb vs LGB

smart bomb and LGB both are nouns.

Word	Noun	Adjective	Verb	Adverb
smart bomb	Yes	No	No	No
LGB	Yes	No	No	No

As nouns, LGB is a hyponym of smart bomb; that is, LGB is a word with a more specific, narrower meaning than smart bomb:

smart bomb: a bomb that can be guided (by a laser beam or radio) to its target
LGB: a smart bomb that seeks the laser light reflected off of the target and uses it to correct its descent

Other hyponyms of smart bomb include laser-guided bomb.

smart bomb (noun)	LGB (noun)
a bomb that can be guided (by a laser beam or radio) to its target	a smart bomb that seeks the laser light reflected off of the target and uses it to correct its descent