Soul kiss is a passionate and intimate act of kissing, and there are several synonyms for it. French kiss or tongue kiss involves the use of tongues, while deep kiss is more intense and intimate. Lip lock refers to a long and firm kissing, while smooch is a romantic kiss that can be light or deep. Eskimo kiss is a non-lip contact kiss, using only the nose, and butterfly kiss involves fluttering eyelashes against the skin. Finally, there is the secretive air kiss, which is a kiss without actual touching of lips on the skin. These synonyms demonstrate the variety and complexity of the act of kissing.