Why do Proto-germanic "-as" nouns have e-grade (don't have an ablaut like Ancient Greek τρέπ-ω τρόπ-ος, πέκ-ω πόκ-ος, λέχ-ομαι λόχ-ος, φέβ-ομαι φόβ-ος)?
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1Likely analogical leveling. There are some with e-grade, which became the -er nouns in German that umlaut the root vowel.– sirideJan 5 at 18:15
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