The first one smells weird; PIE roots are typically triconsonantal and start with a consonant. That ending *-r̥ looks more like a suffix than part of the root itself.
*h₁ḗsh₂r̥ vs. *h₁ésh₂r̥ in the meantime looks like ablaut between lengthened and full grades, but it's hard to rely on Hittite for that - the plene spelling might be there not to indicate a hypothetically long vowel, but for the descendant of that *h₁. (Probably [h] or [ʔ].)
FundMECFS in linguistics
Randon PIE Reconstruction of the Month: h₁ésh₂r̥, flowing blood
https://en.m.wiktionary.org/wiki/Reconstruction:Proto-Indo-European/h%E2%82%81%C3%A9sh%E2%82%82r%CC%A5Ooooh yes, please keep these coming
The first one smells weird; PIE roots are typically triconsonantal and start with a consonant. That ending *-r̥ looks more like a suffix than part of the root itself.
*h₁ḗsh₂r̥ vs. *h₁ésh₂r̥ in the meantime looks like ablaut between lengthened and full grades, but it's hard to rely on Hittite for that - the plene spelling might be there not to indicate a hypothetically long vowel, but for the descendant of that *h₁. (Probably [h] or [ʔ].)