foglamp vs headlamp

foglamp and headlamp both are nouns.

Word	Noun	Adjective	Verb	Adverb
foglamp	Yes	No	No	No
headlamp	Yes	No	No	No

As nouns, headlamp is a hypernym of foglamp; that is, headlamp is a word with a broader meaning than foglamp:

foglamp: headlight that provides strong beam for use in foggy weather
headlamp: a powerful light with reflector; attached to the front of an automobile or locomotive

Other hypernyms of foglamp include headlight.

foglamp (noun)	headlamp (noun)
headlight that provides strong beam for use in foggy weather	a powerful light with reflector; attached to the front of an automobile or locomotive