It's likely you're thinking of suffixes that *end* in "-t", such as:
* -ment: This suffix is used to form nouns that describe a state, action, or result.
* agreement, development, payment
* -ant: This suffix forms nouns that describe a person, place, or thing that does a particular action.
* assistant, accountant, disinfectant
* -ent: Similar to "-ant", but often used for nouns referring to a person or thing with a particular quality.
* student, president, resident
Do you have a specific word in mind or are you interested in more examples of suffixes ending in "-t"? Please let me know and I can provide you with more information!