I think you’d run into trouble with the definition you’ve offered - worship of a single God. In Advaita Vedanta, as a prominent age old example of pantheism, we are all part of the divine. There is not worship of a distinct entity seperate from ourselves, which is a defining characteristic of the practical application monotheism.

Sufism on the other hand has pantheistic elements (beleiving that all creation is part of the divine) but ultimately includes worship of a single distinct divine entity ie. Allah/God.

Agree that we don’t need to go too deep into semantics.