The exceptions
Generally a worse punishment indicates a worse aveira.
However, we have uncovered many exceptions. I.e. cases where an aveira does not have sucha severe punishment, yet it is worse than other aveiros with more severe punishments:
(in the order we presented them over the two threads on the subject obviously some are stronger texamples than others) )
1) Being a Zionist (very big aveira in your view but no punishment)
2) sinas chinam (no classic onesh, yet worse thn gimmel chamuros Yoma 9b)
3) hashcasa zera (no classic punishment yet seforim talk about how serious it is)
4) Sacrificing all kids to Molech (doesnt carry misah , yet obviosly worse than sacrificing some )
5) being boel goy, (no onesh, other than kanoin pogin if caught in the act)
6) Kiruv to Erva ( is yeharog veal yaavor yet no onesh)
7) The situation around an act makes it worse, liek stealing from poor vs rich yet onesh is the same (Shmuel 2:12)
8) murder (is worse than chilul shabbos have to give life for murder not shabbos)
9) Lashon harah (no earthly punishment but sichas mussar says frok the fact that it gets tzoras see it is more serious)
10) embarrasing someone (better to jump in fire “keilu horgo”))
11) swearing fasley (same as #9 gets tzoras)
12) Gasos ruach (ditto)
13) gezel (ditto)
14) stinginess/tzaros ayin (ditto)
15) treating bnos yisoel “kalos/lightly” (sanhedrin 75 b says better person died than talk to girl)
16) Destroying anothers property (BK 60b according to Rashi cant destry property to save life)
17) Nivul hames (Binyan tziyon 170 can’t take deceased’s organs to save life)
18) עֵינַ֣יִם רָ֭מוֹת (passuk Mishlei one of the worst aveiros lists it with יָדַ֗יִם שֹׁפְכ֥וֹת דָּם־נָקִֽי yet no onesh in the classic sense )
19) Lying (same)
20) לֵ֗ב חֹ֭רֵשׁ מַחְשְׁב֣וֹת אָ֑וֶ (same)
21) same
22) פִ֣יחַ כְּ֭זָבִים עֵ֣ד שָׁ֑קֶר (same)
23) מְשַׁלֵּ֥חַ מְ֝דָנִ֗ים בֵּ֣ין אַחִֽים (same)
As a reminder the list of onshim to determine seveity is : Sekilah, sereifa Hereg, chenek, Kares, misha bidei shomayim malkos Rambam Avos 2:1