draughtsman vs draftsman

draughtsman and draftsman both are nouns.

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

As nouns, draughtsman and draftsman are synonyms defined as:

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

Other synonyms of draughtsman include draftsperson.

draughtsman (noun)	draftsman (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