lowland fir vs giant fir

lowland fir and giant fir both are nouns.

Word	Noun	Adjective	Verb	Adverb
lowland fir	Yes	No	No	No
giant fir	Yes	No	No	No

As nouns, lowland fir and giant fir are synonyms defined as:

lowland fir and giant fir: lofty fir of the Pacific coast of northwestern America having long curving branches and deep green leaves

Other synonyms of lowland fir include Abies grandis, grand fir, lowland white fir.

lowland fir (noun)	giant fir (noun)
lofty fir of the Pacific coast of northwestern America having long curving branches and deep green leaves	lofty fir of the Pacific coast of northwestern America having long curving branches and deep green leaves