If you are looking for a word that contains all five letters, it is "onion."
Those letters spell onion.
Those letters spell longer.
Rumina is the word formed using the scrambled letters i n a r m u.It is plural for a part of the stomach of a ruminant.
If you had one more 'n', you could spell maintenance.
The letters can spell the word "attain".
You can spell "Pint"
With the addition of a second "n", those letters can be used to spell "thanksgiving".
The letters RABNO can be rearranged to spell the word baron.
Those letters will spell the word botanical.
Those letters spell noodle.
Those letters will spell the word arrangements.
These letters could be rearranged to spell the word 'banker'.
There is no single American English word that contains all those letters. (It may be a word in Finnish, or an Asian language transliterated to English letters.)