different between onetime vs formerly

English

one +? time

onetime (not comparable)

Alternative form of one-time (“former; past”)
- 2004, The 9-11 Commission, 9/11 Commission Report, Chapter 4:
  A onetime special […] forces officer, he had worked with Albright when she was ambassador to the United Nations and had served on the NSC staff with Clarke.
Alternative form of one-time (“occurring once”)
- 2004, The 9-11 Commission, 9/11 Commission Report, Chapter 6:
  The additional funds included the FBI’s support of the 2002 Winter Olympics in Salt Lake City, Utah (a onetime increase) […]

former +? -ly

(General American) IPA^(key): /?f??m?li/
(Received Pronunciation) IPA^(key): /?f??m?li/
- It may sometimes be overly enunciated like /?f??m?rli/ to stop listeners from confusing it with formally.
Homophone: formally (nonrhotic accents)

formerly (not comparable)

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