aloud
Silenced
An antonym for silent is loud, the antonym for silently is loudly, or aloud.
The five-letter antonym for "silently" that ends in "d" is "loud." This word indicates a high volume or noise level, contrasting with the quietness implied by "silently."
Lound
loud
loudly...
Noisily
Wows
The opposite of noisily is quietly or silently.
Loudly or noisily. Also aloud will work
There do not seem to be any antonyms with a long O sound. There are the words loudly and noisily, which have the OW and OI sounds, respectively.
The antonym of separate that ends in 'n' is "join."