halo spot vs halo blight

halo spot and halo blight both are nouns.

Word	Noun	Adjective	Verb	Adverb
halo spot	Yes	No	No	No
halo blight	Yes	No	No	No

As nouns, halo spot and halo blight are synonyms defined as:

Other synonyms of halo spot include bean blight.

halo spot (noun)	halo blight (noun)
a blight of bean plants	a blight of bean plants
	a blight affecting the leaves of oats and other grasses