No, it is a plural noun. One way to use it as an adjective is to make it possessive (yachtsmen's).
yachtsmen = Segler
yachtsmen yachter sailor
Yachts are in the ocean. Yachtsmen are on many of those yachts.
yachtsman yachtsmen yellowfin
Robert Dearn has written: 'The Island Cruising Club book of ropework for yachtsmen' -- subject(s): Knots and splices
At Dunkirk, off the beaches with hundreds of small boats, many civilian, crewed by yachtsmen, fishermen, tugboat men and other brave civilians
No, it is a verb or a noun (to go around, to surround; a round shape). The adjective form is circular.
It is an adjective.It is a an adjective.
Cautious IS an adjective. An adjective is an action!
An adjective
it is an adjective!
No. It is not an adjective. An adjective describes something.