a tide
water
Brine, Briny, Saline, Salt Water, Ocean Water, Ocean Dew.
The ocean.
Big water
Big water
An "ocean".
ocean
Eddy - a circular movement of water, counter to a main current twinkle- a circular movement of air
The noun ocean is a singular, common, concrete noun; a word for a large body of water; a word for a thing.
Because the words are synonyms of each other, which word you would use depends on the context.SO!.. 'The motion of the ocean' is equivalent to 'The movement of the ocean', but the second example lacks a certain 'rhythm'.
The word "ongoing" doesn't have a past tense as it's not a verb.
Another word for water that starts with the letter 'O' is oxygen dihydrogen.