This is the 901st most frequent Finnish word.
parhaan
"Parhaan" means "the best's" or "of the best" in English.
In this sentence, 'parhaansa' is the partitive form of 'paras', showing possession of 'his/her best efforts.'
Hän teki parhaansa saadakseen projektin valmiiksi.
He did his best to complete the project.
Here, 'parhaat' is the plural form of 'paras', referring to multiple 'best choices.'
Valitsin parhaat vaihtoehdot kaikista mahdollisuuksista.
I chose the best options from all the possibilities.
'Paras' in this case refers to the single best solution, serving as an adjective.