Some examples:
In Spain, the grape harvest begins in late summer. Iowa's corn harvest is the largest in years. We usually harvest the first peas in April.
At harvest time, the workers harvested the harvest.
It depends on how you are using the word in a sentence. For example, "The farmer hired workers to harvest the crops." In that sentence, the word harvest is used as a verb. It tells what the workers were doing to the crops. However, harvest can also be used as a noun, which could mean "the season for gathering crops".
The farmers worked hard to bring in the fall harvest.
I am not writing a sentence using that word.
a sentence using the word endotracheal
This is a sentence using the word aviator.
This year's harvest was truly bountiful.
The workers are gathering the harvest. She is gathering her wits about her.
We have bunkhouses for the seasonal workers who come for the harvest.
this is a sentence using the word armchair.
I am saying a sentence using the word collagen.