さておき

Freq.FrequencyTop 20,000

Meanings

setting aside; leaving aside

usually written using kana alone

Used as a conjunction to introduce a topic while explicitly putting another topic aside. Often appears as ～はさておき.

〈事こと〉はさておきsetting aside X (to move on to another topic)
冗じょう談だんはさておき、本ほん題だいに入はいりましょう。
Joking aside, let's get down to business.
それはさておきleaving that aside (fixed phrase to change the subject)
それはさておき、来らい週しゅうの予よ定ていを確かく認にんしましょう。
Anyway, setting that aside, let's check next week's schedule.

ともかくN3
ともかく means 'anyway/in any case' and moves on without specifically flagging a topic as set aside, while さておき explicitly names the topic being put aside before shifting to another.
別べつとして
別として treats something as a separate matter to be excluded from the current discussion, much like さておき, but 別として is slightly more formal and often used with 'except for' nuance.
ともあれ
ともあれ means 'in any case, be that as it may' and is used to move past a prior point without pinpointing it, whereas さておき deliberately names the topic being set aside.
それはさておき
さておき is the core verb form meaning 'setting aside,' while それはさておき is the fuller fixed phrase that explicitly names 'that' as the thing being set aside.

From さて (well, now) + 置き (continuative form of 置く, to put/place). Literally 'putting that aside'.