blond vs light-haired

blond is a noun but light-haired is not a noun.

Word	Noun	Adjective	Verb	Adverb
blond	Yes	Yes	No	No
light-haired	No	Yes	No	No

As adjectives, blond and light-haired are synonyms defined as:

blond and light-haired: being or having light colored skin and hair and usually blue or grey eyes

Other synonyms of blond include blonde.

blond (noun)	light-haired (noun)
a light grayish yellow to near white
a male person with fair skin and hair

blond (adjective)	light-haired (adjective)
being or having light colored skin and hair and usually blue or grey eyes	being or having light colored skin and hair and usually blue or grey eyes