Synonyms of the word

optimal

• adj. The best, most favourable or desirable, especially under some restriction.

best

• adj. superlative form of good: most good.
• adj. Most; largest.
• adv. superlative form of well: most well.
• adv. To the most advantage; with the most success, cause, profit, benefit, or propriety.
• n. (uncountable) The supreme effort one can make, or has made.
• n. (uncountable) One's best behavior.
• n. (countable) The person (or persons; or thing or things) that is (are) most excellent.
• v. To surpass in skill or achievement.
• v. (transitive) To beat in a contest;.

optimum

• n. The best or most favorable condition, or the greatest amount or degree possible under specific sets of…
• adj. best or most advantageous; surpassing all others.