1. I built a countdown timer application with a pause and resume option.
2. I built a countdown timer application with a pause and resume functionality.
I feel that "functionality" sounds more professional,but I'd like to know your opinion as well.
An option is a choice. It fits the context, but I think 'functionality' might be the word you want. However, to my ear it seems more like an uncountable noun.
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An option is a choice. It fits the context, but I think 'functionality' might be the word you want. However, to my ear it seems more like an uncountable noun. I'd leave out "a".
... with pause and resume functionality.
CJ