Ad. agental-formation grammar.
In other examples, the agental form seems to use an agental suffix -ân², also with the initial element of the compound in the objective case:
|magân “wright, *builder”||⇒||Balkumagân “Shipwright” (PM/151)|
|phazgân “?ruler”||⇒||kathuphazgân “conqueror, ?all-ruler” (SD/429)|
This agental suffix appears in standalone words, such as sapthân “wise man”, so perhaps it is used to create agental forms as independent nouns, which can sometimes be used in compounds. This suffix may also be related to the suffix -ân¹ used to form participles (adjectives from verbs). See the entry on participle for further discussion.
|#-bêl||← bel-||⇒ Azrubêl||✧ PM/373|
|#-bēl||← bel-||⇒ Azrubēl||✧ SD/305|
|#-bēth||[← #bith-]||⇒ izindu-bēth||✧ SD/427|
|nitīr||“kindler”||[← *nitir-]||⇒ Gimilnitīr, gimlu-nitīr||✧ SD/428|
|#-zîr||[← zîr-]||⇒ Aphanuzîr||✧ SD/389|
|#-zîr||[← zîr-]||⇒ Nimruzîr||✧ SD/389|