A textonym is a word which becomes ambiguous when using predictive text due to having the same button combination as other unrelated words. They often make a text confusing or incomprehensible.
Particularly prominent in drunk texting.

He = If
Me = Of
Book = Cool
Soon = Room

Whenever making a congratulatory remark, this is what you say. Made popular by Kamala Harris when she and Joe Biden won the presidency.

When using predictive text to write an SMS, sometimes an unexpected word of similar / humorous meaning may pop up.

Pint / shot / riot

Kiss / lips

Shag / rich

Sips / piss

Cock / anal

Dual / fuck

In text or SMS messaging, a textonym is a word that is typed using the same sequence of keys on a phone's numeric keypad as another word.

Words that are related in their combination of button strokes, usually on a phone's number-pad and with T-9 or similar methods.

Variant/Incorrect spelling of txtonym.

Two or more words that are spelled using the same series of keys in a text message.

"Me" and "of" are both entered using 6-3.

Also "good", "home", "gone", "hood", "hoof", and "goof" are textonyms.