phasmid vs leaf insect

phasmid and leaf insect both are nouns.

Word	Noun	Adjective	Verb	Adverb
phasmid	Yes	No	No	No
leaf insect	Yes	No	No	No

As nouns, leaf insect is a hyponym of phasmid; that is, leaf insect is a word with a more specific, narrower meaning than phasmid:

phasmid: large cylindrical or flattened mostly tropical insects with long strong legs that feed on plants; walking sticks and leaf insects
leaf insect: tropical insect having a flattened leaflike body; common in southern Asia and the East Indies

Other hyponyms of phasmid include stick insect, walking stick, walkingstick, walking leaf.

phasmid (noun)	leaf insect (noun)
large cylindrical or flattened mostly tropical insects with long strong legs that feed on plants; walking sticks and leaf insects	tropical insect having a flattened leaflike body; common in southern Asia and the East Indies