draftsman vs draughtsman

draftsman and draughtsman both are nouns.

Word	Noun	Adjective	Verb	Adverb
draftsman	Yes	No	No	No
draughtsman	Yes	No	No	No

As nouns, draftsman and draughtsman are synonyms defined as:

draftsman and draughtsman: a skilled worker who draws plans of buildings or machines

Other synonyms of draftsman include draftsperson.

draftsman (noun)	draughtsman (noun)
a skilled worker who draws plans of buildings or machines	a skilled worker who draws plans of buildings or machines
an artist skilled at drawing