furring vs furring strip

furring and furring strip both are nouns.

Word	Noun	Adjective	Verb	Adverb
furring	Yes	No	No	No
furring strip	Yes	No	No	No

As nouns, furring and furring strip are synonyms defined as:

furring and furring strip: strip used to give a level surface for attaching wallboard

furring (noun)	furring strip (noun)
strip used to give a level surface for attaching wallboard	strip used to give a level surface for attaching wallboard
a furlike coating of matter as on the tongue