Rashi on Leviticus 24:16/רש"י על ויקרא כ״ד:ט״ז

1ונקב שם AND HE THAT UTTERETH BLASPHEMOUSLY THE NAME [OF THE LORD SHALL SURELY BE PUT TO DEATH] — He is not liable to the death-penalty at the hand of the judges unless he utters the Divine Tetragrammaton blasphemously, but not if he execrateth the Lord by only mention of one of the substitutes for the Divine name (e. g., רחום, חנון, אל etc.), (cf. Sifra, Emor, Chapter 19 5; Sanhedrin 56a).

2ונקב here is an expression denoting “cursing”, like (Numbers 23:8) “How shall I curse (אקב) [when God hath not cursed]” (Sanhedrin 56a).