flitter vs move back and forth

flitter and move back and forth both are verbs.

Word	Noun	Adjective	Verb	Adverb
flitter	No	No	Yes	No
move back and forth	No	No	Yes	No

As verbs, move back and forth is a hypernym of flitter; that is, move back and forth is a word with a broader meaning than flitter:

flitter: move back and forth very rapidly
move back and forth: move in one direction and then into the opposite direction

flitter (verb)	move back and forth (verb)
move back and forth very rapidly	move in one direction and then into the opposite direction