guaiacum wood vs guaiac wood

guaiacum wood and guaiac wood both are nouns.

Word	Noun	Adjective	Verb	Adverb
guaiacum wood	Yes	No	No	No
guaiac wood	Yes	No	No	No

As nouns, guaiacum wood and guaiac wood are synonyms defined as:

guaiacum wood and guaiac wood: heartwood of a palo santo; yields an aromatic oil used in perfumes

guaiacum wood (noun)	guaiac wood (noun)
heartwood of a palo santo; yields an aromatic oil used in perfumes	heartwood of a palo santo; yields an aromatic oil used in perfumes