life vs energy

life and energy both are nouns.

Word	Noun	Adjective	Verb	Adverb
life	Yes	No	No	No
energy	Yes	No	No	No

As nouns, energy is a hyponym of life; that is, energy is a word with a more specific, narrower meaning than life:

life (noun)	energy (noun)
living things collectively	forceful exertion
animation and energy in action or expression	an imaginative lively style (especially style of writing)
the experience of being alive; the course of human events and activities	enterprising or ambitious drive
an account of the series of events making up a person's life	(physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs
a motive for living	any source of usable power
a living person	a healthy capacity for vigorous activity
the organic phenomenon that distinguishes living organisms from nonliving ones
the condition of living or the state of being alive
a characteristic state or mode of living
the course of existence of an individual; the actions and events that occur in living
the period during which something is functional (as between birth and death)
the period between birth and the present time
the period from the present until death
a prison term lasting as long as the prisoner lives