not including fish, dolphins sharks and anything else that lives under water
Answers (1)
You can go to google.com and type "define ***" replacing the stars with any word to get a definition of the word. You can type "define word1 vs word2" to get a comparison of definitions for two words. You can type "etymology ***" to get a history of the development of a word.
Do that for each word in your question. Heavy things do not float under water.