Both
onetime means occurring only once, or formerly, depending on usage as adjective or adverb.
one time; as to have a turn only once.
Forty one is the correct spelling.
The correct spelling is "forty one".
"Seagull" is the correct spelling of "seagull".
That is the correct spelling of "recipient" (one who has received something).
That is the correct spelling of the word "multiple" (more than one, or a higher number).The correct spelling is multiple (more than one, many).
The correct spelling is propaganda (misleading, one-sided, or manipulative information).
It is one word, not two. The correct spelling is goodbye.
There is only one i in it, which is at the end. So the correct spelling is Alumni.
That is the correct spelling of "quicker" (faster).
The one you used is correct.
That is the correct spelling of "communication" (exchanging info or ideas).
The correct spelling is bestiality. It is one of the most commonly misspelled words.