No, the compound word 'underwater' is an adjective or an adverb. Examples:
Our botany class is studying underwater plants. (adjective)
Our swimming class is learning to swim underwater. (adverb)
The plural is underwater roller coasters. The word underwater is an adjective describing roller coaster, adjectives don't take plural forms. Roller coaster is an open compound noun, the plural 's' goes on the end of the noun.
Yes, the word 'tsunami' is a noun, a word for an enormous sea wave caused by an underwater earthquake or volcanic eruption; a word for a thing.
A pronoun can be a noun . A noun is simply the subject of a sentence
No. As a noun, harvest would be considered a common noun.
No, "he" and "she" are pronouns, not nouns. Pronouns are used to replace nouns in sentences to avoid repetition.
The word "patience" is considered a noun. It refers to the ability to wait calmly for something or to endure delay without getting angry or upset.
Yes, the word ledge is a noun, a singular, common, concrete noun; a word for a narrow horizontal surface projecting from a wall, cliff, or other surface; an underwater ridge; a word for a thing.
No, SCUBER is not a word it is an acronym and one of its meanings is "Self-Contained Underwater Breathing Apparatus"
No, "dirty" is not considered a noun. It is an adjective used to describe something that is unclean or soiled.
No, not everything is a noun. In grammar, nouns are words that represent people, places, things, or ideas. There are also other parts of speech, such as verbs, adjectives, adverbs, pronouns, prepositions, and conjunctions that serve different purposes in a sentence.
No
Development is an abstract noun, a word for a process or a state.