headshot vs photograph

headshot and photograph both are nouns.

Word	Noun	Adjective	Verb	Adverb
headshot	Yes	No	No	No
photograph	Yes	No	Yes	No

As nouns, photograph is a hypernym of headshot; that is, photograph is a word with a broader meaning than headshot:

headshot: a photograph of a person's head
photograph: a representation of a person or scene in the form of a print or transparent slide or in digital format

Other hypernyms of headshot include exposure, photo, pic, picture.

headshot (noun)	photograph (noun)
a shot aimed at a person's head	a representation of a person or scene in the form of a print or transparent slide or in digital format
an attempt to put the soccer ball into the net by using the head
a photograph of a person's head

headshot (verb)	photograph (verb)
	record on photographic film
	undergo being photographed in a certain way