Oof vs. Foo

Oofinterjection

A sound mimicking the loss of air, as if someone's solar plexus had just been struck.

Oofinterjection

(slang) expressing sympathy at another's pain, shock at a high price, etc.

Oofnoun

A sound made in pain, as when expelling air after being struck.

Oofnoun

Money.

Foonoun

: an administrative subdivision of imperial China; the capital of such divisions.

Foonoun

(programming) A metasyntactic variable used to represent an unspecified entity. If part of a series of such entities, it is often the first in the series, and followed immediately by bar.

Foonoun

(fandom slang) gloss=placeholder god

Foonoun

(slang) fool

Foointerjection

Expression of disappointment or disgust.