We don't have any synonyms for if only yet.
Think if only belongs in the thesaurus? Recommend it and we'll take a look.
Definition of if only:
°Alone in a category.
"He is the only doctor for miles."
"He is the only trombonist to recruit."
"my heart is hers, and hers only"
"if there were only one more ticket!"
°Under the condition that;
but.