andiron vs firedog

andiron and firedog both are nouns.

Word	Noun	Adjective	Verb	Adverb
andiron	Yes	No	No	No
firedog	Yes	No	No	No

As nouns, andiron and firedog are synonyms defined as:

Other synonyms of andiron include dog-iron, dog.

andiron (noun)	firedog (noun)
metal supports for logs in a fireplace	metal supports for logs in a fireplace