hawthorn vs red haw

hawthorn and red haw both are nouns.

Word	Noun	Adjective	Verb	Adverb
hawthorn	Yes	No	No	No
red haw	Yes	No	No	No

As nouns, red haw is a hyponym of hawthorn; that is, red haw is a word with a more specific, narrower meaning than hawthorn:

hawthorn: a spring-flowering shrub or small tree of the genus Crataegus
red haw: American red-fruited hawthorn with stems and leaves densely covered with short woolly hairs

hawthorn (noun)	red haw (noun)
a spring-flowering shrub or small tree of the genus Crataegus	American red-fruited hawthorn with stems and leaves densely covered with short woolly hairs
	American red-fruited hawthorn with dense corymbs of pink-red flowers