Well, that's like one of the most used words in Japanese or something, its widest usage is as a particle which has numorous usages of which 'relating' words and phrases together can be mentioned (making modifiers, negative imperative, etc.).
But if you mean the word 'na', it could mean 'name' , 'vegetables' most commonly.
Sensai na
Yokoshima na
binsho na
Kan'nō-teki na
Chimei-teki na
Ijiwaru na hito
Miwaku-teki na
'Ichiban suki na'
You may say 'shinsei na'.
忠実な Chūjitsu na
謙虚な Kenkyo na
勇敢な Yūkan na