1) Alterability 2) Changeableness 3) Mutableness 4) Transience 5) Variability 1) Changeability 2) Changeableness 3) Mutableness 
[poem] Mutability is a poem by Percy Bysshe Shelley which appeared in the 1816 collection Alastor, or The Spirit of Solitude: And Other Poems. Half of the poem is quoted in his wife Mary Shelley`s novel Frankenstein although his authorship is not acknowledged. The eight lines from the poem `Mutability` which are quoted in Frankenstein; or, ...
Mu`ta·bil'i·ty noun [ Latin mutabilitas : confer French mutabilité .] The quality of being mutable, or subject to change or alteration, either in form, state, or essential character; susceptibility of change; changeableness; inconstancy; variation. « Plato confessed that the heaven...
[n] - the quality of being capable of mutation
mutableness noun the quality of being capable of mutation
[PSAT glossary] the quality of being capable of mutation