"He" and "his" may be capitalized when the word begins a sentence, or refers to God, a king (His Majesty), or a religious leader such as the Pope (His Holiness).
Polish polish
Polish: when you are from Poland, you are Polish
polish: like furniture polish or nail polish
Trust me it is Polish and polish because It was a riddle on my test and I wrote those two...
It's not a proper noun. Its a pronoun. The only pronouns that are capitalized by convention are "I" and pronouns referring to God. The grammar rules of the English language have a lot of oddities...