Hercules-club vs Hercules'-club

Hercules-club and Hercules'-club both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hercules-club	Yes	No	No	No
Hercules'-club	Yes	No	No	No

As nouns, Hercules-club and Hercules'-club are synonyms defined as:

Hercules-club and Hercules'-club: densely spiny ornamental of southeastern United States and West Indies

Other synonyms of Hercules-club include Hercules'-clubs, Zanthoxylum clava-herculis.

Hercules-club (noun)	Hercules'-club (noun)
densely spiny ornamental of southeastern United States and West Indies	densely spiny ornamental of southeastern United States and West Indies
	small deciduous clump-forming tree or shrub of eastern United States