silky oak vs Grevillea robusta

silky oak and Grevillea robusta both are nouns.

Word	Noun	Adjective	Verb	Adverb
silky oak	Yes	No	No	No
Grevillea robusta	Yes	No	No	No

As nouns, silky oak and Grevillea robusta are synonyms defined as:

silky oak and Grevillea robusta: medium to tall fast-growing tree with orange flowers and feathery bipinnate leaves silky-hairy beneath; eastern Australia

silky oak (noun)	Grevillea robusta (noun)
medium to tall fast-growing tree with orange flowers and feathery bipinnate leaves silky-hairy beneath; eastern Australia	medium to tall fast-growing tree with orange flowers and feathery bipinnate leaves silky-hairy beneath; eastern Australia