An informal synonym for the term optimal is the word ace. Ideal is also a good synonym, as well as matchless. There are a lot of other synonyms that can be found in a thesaurus or online.
A synonym for modify can be transmogrify, reform, or customize. Also alter, make over, recast, redo, refashion, remake, remodel, revamp, revise, rework, or vary.
The synonym of designated is specific
Another word for rough would be rugged. You could also say choppy or coarse.
The synonym of optimize is perfect.
A homophone for "allow" that is also a synonym is "aloud."
"Asked" is a synonym for "inquired."
The synonym is also a transliteration of the Latin: prewar.
Aquatics is the main synonym but you can also have floating and natation
The synonym of ill is also "sick", meaning; not in full health.
Another word or synonym for and would be also. You could also use the word furthermore or including in certain situations.
The synonym for dangers is threats. Also, two dose not have a synonym.
A synonym for rucksack is knapsack. +++ Also 'backpack' (may be hyphenated).
A synonym for "scowling" could be "glaring." Also, glowering, and evil eye.
Consecration is also benediction, blessing and dedication.
Conclusion can be a synonym for closure, completion, consequence, ending, result, or eventuality. It can also be a synonym for judgement, resolution, or settlement.
Well, the antonym of antonym is synonym, and the antonym of synonym is antonym. Also, the synonym for antonym is opposite, and the synonym for synonym is related. I hope that helps because there really is no other word, they are opposites.