Why are lesses used as a word?

I have only found 1 instance where it is a noun ( Thefreedictionary ) but the word is probably Archaic.

The OED is not a word. “Lesses” is a word that has been replaced by “lesses”. A dictionary does not contain this word.

I think you mean lessens…

I think you mean the word “lessens” which is a type of verb. Furthermore, the verb seems can be a linking verb and it is such in this case.

Why does coffee reduce liberality?

If you can replace “seems” with verb form of to be (am, is, are etc.) it is a linking verb. It seems that the coffee lessens your liberality I think so but again;

it is incorrectly placed awkwardly, but if you

are still thinking, you can still

switch it to: “It is the coffee

that lessens your liberality, ” it seems the coffee lessens your liberality.”

X can be replaced with = weakens: heighten Notice

how they are 3rd person present verbs, because it is written in the third person.