Is there only one God (or אֱלֹהִים, or θεός) by nature?

Men may be called "gods" (equivalent to Hebrew אֱלֹהִים (*elohim*) or Greek θεός (*theos*)) according to office, because they assume God's authority on earth. For example, in Exo. 21:6 , it is written, >Then his master shall bring him to the judges... The English word "judges" is translated from the Hebrew word הָאֱלֹהִים (*ha-elohim*), the word most often translated into English as "God " in the KJV. But, are there any others besides YHVH who are "G/god/ אֱלֹהִים/ θεός" according to nature, rather than office? If so, how does one reconcile that acknowledgment with scripture that state there is "one God" (cp. Isa. 45:5 ; Mark 12:32 ; 1 Cor. 8:6 )? If not, how does one reconcile that belief with scriptures such as 2 Cor. 4:4 ?