H6352. pecham
מֶּחָם noun [masculine] coal (collective); absolute ׳פ, as inflammable, ׳פ לְגֶחָלִים [Prov 26:21] (charcoal for embers, Toy); of glowing coal [Isa 44:12], פ ׳אֵשׁ [54:16]; [Psa 11:6] for אֵשׁ מַּחִ֑ים ᵑ0 read אֵשׁ מַּחַם (or מַּחֲמֵי) coals of fire (|| גָּפְרִית), so Ew and others
פחת (√ of following; compare Arabic cut off, VII. be perforated (of roof); Syriac Pa`el pierce, break through, pit, chasm; Late Hebrew מָּחַת dig, hollow out, also diminish).