The words "our" and "hour" are known as homophones, meaning 'sound the same.' They have no common usage, nor similar context, merely just sound quite similar when read aloud or spoken.
A synonym is a word that has a similar meaning to another word of reference. And, quite the contrary, an antonym has the opposite meaning as the word of reference.
For example, the words "red" and "read" sound alike, but have completely different meanings and contexts. Red is an adjective describing the color of a noun or pronoun, whereas "read" is the past participle of the verb "to read."
The word "jolly" is a synonym of the adjective "happy," because they have similar meanings. However, the adjectives "upset" or "sad" have the opposite meaning as "happy," thus making them antonyms of the word.
