stick insect vs walking stick

stick insect and walking stick both are nouns.

Word	Noun	Adjective	Verb	Adverb
stick insect	Yes	No	No	No
walking stick	Yes	No	No	No

As nouns, stick insect and walking stick are synonyms defined as:

stick insect and walking stick: any of various mostly tropical insects having long twiglike bodies

Other synonyms of stick insect include walkingstick.

stick insect (noun)	walking stick (noun)
any of various mostly tropical insects having long twiglike bodies	any of various mostly tropical insects having long twiglike bodies
	a stick carried in the hand for support in walking