segment vs internode

segment and internode both are nouns.

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

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

Other hyponyms of segment include metamere, somite, sarcomere, section.

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

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