segment vs syllabise

segment is a noun but syllabise is not a noun.

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

As verbs, syllabise is a hyponym of segment; that is, syllabise is a word with a more specific, narrower meaning than segment:

Other hyponyms of segment include syllabicate, syllabify, syllabize, quarter.

segment (noun)	syllabise (noun)
one of several parts or pieces that fit with others to constitute a whole object
one of the parts into which something naturally divides

segment (verb)	syllabise (verb)
divide into segments	utter with distinct articulation of each syllable
divide or split up	divide into syllables