The word raft can be both used as a noun and a verb.
raft concrete
Using 'a raft of' preceding a noun is a term for a 'large quantity' of that thing.
The collective noun for 'swimmers' is a raft of swimmers.
The plural of otter is otters.
The word 'rafting' is a gerund, which functions as a noun in a sentence. It is formed by adding the -ing ending to a verb (raft) and is used to describe the activity of traveling in a raft.
The noun 'rafter' is a singular, common, concrete noun; a word for a support beam of a structure, a word for a thing; a word for someone riding a raft, a word for a person.
The opposite of the noun raft could be "submersible" which would keep you under the water rather than above. Or possibly "ballast" (weight to keep you underwater).More arcane would be "pool" which is a water above a dry surface, while a raft is a dry place above a water surface.*The less frequent use of raft to mean a large unspecified number (e.g. a raft of problems) could have the antonyms few or countable or numerable.
They raft.
Types of raft foundation are 1. Solid slab raft 2. Beam and slab raft 3. Cellular rafts
The raft is breaking up, sir! Let's jump onto another raft as soon as we can. That's Tom Sawyer's raft.
There is no standard collective noun for 'seamen', however, the collective nouns for sailors will work:a crew of seamena deck of seamenA collective noun is an informal part of language. Any noun that suits the situation can function as a collective noun; for example, a boatload of seamen or a raft of seamen.
Yes, the noun team can function as a collective noun for swimmers.Collective nouns are an informal part of language. Any noun that suits the context can function as a collective noun.The standard collective nouns for the noun 'swimmers' are:a raft of swimmersa league of long distance swimmers