photomicrograph vs pic

photomicrograph and pic both are nouns.

Word	Noun	Adjective	Verb	Adverb
photomicrograph	Yes	No	No	No
pic	Yes	No	No	No

As nouns, pic is a hypernym of photomicrograph; that is, pic is a word with a broader meaning than photomicrograph:

photomicrograph: a photograph taken with the help of a microscope
pic: a representation of a person or scene in the form of a print or transparent slide or in digital format

Other hypernyms of photomicrograph include exposure, photo, photograph, picture.

photomicrograph (noun)	pic (noun)
a photograph taken with the help of a microscope	a representation of a person or scene in the form of a print or transparent slide or in digital format
	a form of entertainment that enacts a story by sound and a sequence of images giving the illusion of continuous movement