wingspan vs wingspread

wingspan and wingspread both are nouns.

Word	Noun	Adjective	Verb	Adverb
wingspan	Yes	No	No	No
wingspread	Yes	No	No	No

As nouns, wingspan and wingspread are synonyms defined as:

wingspan and wingspread: linear distance between the extremities of an airfoil

wingspan (noun)	wingspread (noun)
linear distance between the extremities of an airfoil	distance between the tips of the wings (as of a bird or insect) when fully extended
	linear distance between the extremities of an airfoil