Deny
To say that sth is not true, especially when other people are saying it is
Admit
To say sth is true, although you don’t want to say this
Apologize for
Sorry
Insist
To say firmly that sth is or isn’t correct, when other people are saying the opposite
Suggest (2 meanings)
1 to tell someone about your ideas
2 to say sth is true but not in a strong or direct way
Advise
To tell someone what you think they should do, in a polite way
Demand
To ask for sth very firmly or aggressively
Offer
To say that you are willing to do sth