Yes
"A penny" isn't an idiom - it's just a one-cent American coin.
The words cent and penny are synonymous; a cent is a penny.
No such coin. A penny is one cent so a 2 cent penny does not exist. There are US Two- Cent pieces but a date is needed.
a penny means that it is a kind of coin that is worth 1 cent.
One penny is equal to 1 cent.
That would be cent, as in 1 cent is the same as 1 penny.
A penny stock is one that is relatively cheap and does not actually mean that the stock is one cent. The penny stocks are usually high risk but high reward.
One penny is equal to one cent. Therefore, it takes one penny to make a cent.
i cent
One cent.
penny
It's worth exactly one cent.