The suffix -oate is the IUPAC nomenclature used in organic chemistry to form names of compounds formed from carboxylic acids. They are of two types:
The suffix is derived from "-oic acid".
The most common example of compounds with sufix "oate" are Ester which contain organic compounds with suffix "oate". Example - Ethyl acetate of formula - CH3-COO-CH2-CH3
References
-oate Wikipedia(Text) CC BY-SA