loudly...
powerful
ou ou ou ou ou ou
No. It has the OW sound, which is not considered a long vowel and is indicated by /ou/. This is the sound in fowl (ow) and foul (ou).
Lound
Loudly or noisily. Also aloud will work
powerful
The antonym for "silently" with a long "o" vowel sound is "vocally".
An antonym for silent is loud, the antonym for silently is loudly, or aloud.
ou ou ou ou ou ou
ou! ;)
Silenced
aloud
Loudly.
The opposite of noisily is quietly or silently.
No. It has the OW sound, which is not considered a long vowel and is indicated by /ou/. This is the sound in fowl (ow) and foul (ou).
"OU" makes the "ow" sound, and the "e" at the end is silent.
The OU pair in house is the diphthong OU/OW as in how and mouse.