The forms are:
universe - (noun) the entirety of stars and space
universal - (adjective) of the universe, or made for overall use
university
un
un poco
You spell on in Welsh as ar.
"I am a gangster" in French is spelled as "Je suis un gangster."
a jumper is called "un pull / un pullover / un sweat" in French
un canonnier, un mitrailleur (smaller calibers)
How do you spell pig in French? un cochonle porc
un calendario
un ensemble
un sandwich
un souhait
un/une
un roman