Nouns

(n)line of life, life line, lifelinea crease on the palm; its length is said by palmists to indicate how long you will live
(n)lifelinesupport that enables people to survive or to continue doing something (often by providing an essential connection)“the airlift provided a lifeline for Berlin”, “she offered me a lifeline in my time of grief”
(n)lifelineline that raises or lowers a deep-sea diver
(n)lifelineline thrown from a vessel that people can cling to in order to save themselves from drowning