Solution

LIFE

2 clues

Existence

Word class: Common noun
Nature of clue: Synonym
Difficulty: Very easy
Sources: Boatload Puzzles
Topics: Biology, Philosophy

Vitality

Word class: Common noun
Nature of clue: Synonym
Difficulty: Very easy
Sources: Boatload Puzzles
Topics: Biology

Other solutions to Vitality

Words are categorized by artificial intelligence: there can be mistakes.