--> Possessively has double 'ss' twice appearing mispronounced as 's'
Remember double 'SS' appears twice in this word which should not be misspelled with single 'S'
Wrong Spelling:  po-s-e-s-ively 
Correct Spelling:  po-ss-e-ss-ively 
Find more incorrect spellings of Possessively to spell right way.