redwood penstemon vs red shrubby penstemon

redwood penstemon and red shrubby penstemon both are nouns.

Word	Noun	Adjective	Verb	Adverb
redwood penstemon	Yes	No	No	No
red shrubby penstemon	Yes	No	No	No

As nouns, redwood penstemon and red shrubby penstemon are synonyms defined as:

redwood penstemon and red shrubby penstemon: low branching dark green shrub with bunches of brick-red flowers at ends of branches; coastal ranges and foothills of northern California

redwood penstemon (noun)	red shrubby penstemon (noun)
low branching dark green shrub with bunches of brick-red flowers at ends of branches; coastal ranges and foothills of northern California	low branching dark green shrub with bunches of brick-red flowers at ends of branches; coastal ranges and foothills of northern California