A proponent is someone who argues in favor of something. Here are some sentences.
A conservationist at heart, I'm a proponent of recycling and composting.
The infinitive of the verb form of proponent is 'to propound.'
As a former high school athlete, the principal is a big proponent of Title IX.
Lucretia Coffin Mott and Elizabeth Cady Stanton were among the first proponent of women's suffrage in United States.
I was a proponent of the judicial system until that litigious son of a gun sued me.
The word proponent is a noun.
I am not writing a sentence using that word.
I can give you a sentence using the word galaxy.
As a proponent of limiting the number of daily coal trains using the waterfront tracks, Jacob spoke at the City Counsel Meeting. Jacob was only one of many such proponents.
This is a sentence using the word aviator.
a sentence using the word endotracheal
When she learned how the air and water were bring polluted, she became a strong proponent of ecological reforms.
This is a sentence using the word monomer. :P
I am saying a sentence using the word collagen.