segment vs segmentation

segment and segmentation both are nouns.

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

segment (noun)	segmentation (noun)
one of several parts or pieces that fit with others to constitute a whole object	the act of dividing or partitioning; separation by the creation of a boundary that divides or keeps apart
one of the parts into which something naturally divides	(embryology) the repeated division of a fertilised ovum

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