〜はもちろん / 〜はもとより
To say nothing of 〜はもちろん / 〜はもとより
Meaning
"~ goes without saying, and also …".
Formation
[noun] + はもちろん · [noun] + はもとより
Notes
The first item is taken as obvious; the point of interest is the second, which takes も. はもとより is the formal written twin of はもちろん.
Examples
彼（かれ）は英語（えいご）はもちろん、中国語（ちゅうごくご）も話（はな）せます。
English goes without saying — he speaks Chinese too.
Breakdown
週末（しゅうまつ）はもちろん、平日（へいじつ）も営業（えいぎょう）しています。
We are open on weekdays as well as weekends, of course.
Breakdown
子（こ）どもはもちろん、大人（おとな）にも人気（にんき）があります。
It is popular with adults as well as children.
Breakdown
味（あじ）はもとより、見た目（みため）も美（うつく）しい料理（りょうり）です。
The taste goes without saying, and it looks beautiful too.
Breakdown
費用（ひよう）はもちろん、時間（じかん）もかかります。
It costs money, of course, and time as well.
Breakdown
⚠️ Often confused with
〜ばかりか / 〜ばかりでなく
Not only 〜ばかりか / 〜ばかりでなく
"Not only ~, but also …".
〜のみならず
Not merely 〜のみならず
"Not merely ~, but also …" — the formal written "not only".
〜に加えて
In addition to 〜に加えて
"In addition to ~", "on top of ~".
〜はおろか
Let alone 〜はおろか
"Let alone ~", "not only not ~ but not even ..." — the easier case fails too.
〜すら
Not even (emphatic) 〜すら
"Even ~", "not even ~" — a written, emphatic さえ.
〜にとどまらず
Not confined to 〜にとどまらず
"Not confined to ~", "not stopping at ~ but spreading further".