The word 'act' is both a verb and a noun; for example:
Verb: You shouldn't act so gleeful, your gain is someone's loss.
Noun: The first act was confusing but the second act pulled the plot together.
Some other noun forms are action and activity.
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Accumulation is a noun - the act of accumulating
The noun form of the adjective 'able' is ability.
The noun form for the verb to anticipate is anticipator, one who anticipates. Anticipation is another noun form.
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The abstract noun forms of the verb to achieve are achievement and the gerund, achieving.