Use of a word such as "rallier" ,but not "tallier"

I would like to know if "ier" after a verb connotes there is a noun form for that verb. The only one I could find is 'rally ' and 'rallier' . But there is no tallier for tally. I was told by a friend of mine that 'ier' can never be used as the noun form of a verb. Yet , to rally and a rallier seem to contradict that statement. To tally and a tallier are not correct. Ier after a verb usually denotes on of the 3 forms of comparison of that verb. Right?
Can you give me any other verbs as rally which have a noun form by adding ier.?
How will I find the answer to this question I am asking?
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My name is Clementina
Thank you