else vs if only

else

• For otherwise; or else. 

• Otherwise, if not. 

• Other; in addition to previously mentioned items. 

if only

• Even if for no other reason than; only just. 

• Used other than figuratively or idiomatically: see if, only. 

• I wish that; signifies a wish or desire for the present or the future. 

• I wish that; signifies a regret about an action in the past.