Here is a list of nouns that start with EQU.
equal, equality, equalization, equalizing, equanimity
equating, equation, equator, equilibrium, equine
equipment, equipping, equity, equivalence, equivalent
Hope you enjoy this page of nouns that start with equ and the rest of this noun list a-z site as well.
Help make this a better resource by adding more nouns in the comments section. Thanks.