Is 'ment' a word? I had 'went' and wrote 'ment' on a whim and it accepted it and I was quite surprised.

https://www.merriam-webster.com/dictionary/ment

according to Merriam-Webster it's only a suffix

Oxford (an "exhaustive" dictionary) has several transitive verbs:

https://www.oed.com/search/dictionary/?scope=Entries&q=ment