Vanda caerulea vs blue orchid

Vanda caerulea and blue orchid both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vanda caerulea	Yes	No	No	No
blue orchid	Yes	No	No	No

As nouns, Vanda caerulea and blue orchid are synonyms defined as:

Vanda caerulea and blue orchid: famous orchid of northern India having large pale to deep lilac-blue flowers

Vanda caerulea (noun)	blue orchid (noun)
famous orchid of northern India having large pale to deep lilac-blue flowers	famous orchid of northern India having large pale to deep lilac-blue flowers