segment vs unit

segment and unit both are nouns.

Word	Noun	Adjective	Verb	Adverb
segment	Yes	No	Yes	No
unit	Yes	No	No	No

segment (noun)	unit (noun)
one of several parts or pieces that fit with others to constitute a whole object	an assemblage of parts that is regarded as a single entity
one of the parts into which something naturally divides	a single undivided whole
	an organization regarded as part of a larger social group
	a single undivided natural thing occurring in the composition of something else
	any division of quantity accepted as a standard of measurement or exchange
	an individual or group or structure or other entity regarded as a structural or functional constituent of a whole

segment (verb)	unit (verb)
divide into segments
divide or split up