'Un' means 'One' in French. It is also used to say 'a' when talking about something that is masculine. The feminine version is 'une'.
1 in French is 'un'
You say un crayon in French.
a peacock is called "un paon" in French (do not pronounce the "o" in the word)
'un but' (masc.)
un four is an oven in French
un mois means 'a month' in French.
"un bus" is a bus in French.
un sac is a bag in French.
a jumper is called "un pull / un pullover / un sweat" in French
"J'ai un" in French translates to "I have a" in English.
a raincoat is 'un imperméable' or 'un manteau' in French.
A bed is 'un lit' in French.