sentimentalism vs formulation

sentimentalism and formulation both are nouns.

Word	Noun	Adjective	Verb	Adverb
sentimentalism	Yes	No	No	No
formulation	Yes	No	No	No

As nouns, formulation is a hypernym of sentimentalism; that is, formulation is a word with a broader meaning than sentimentalism:

sentimentalism: the excessive expression of tender feelings, nostalgia, or sadness in any form
formulation: the style of expressing yourself

Other hypernyms of sentimentalism include expression.

sentimentalism (noun)	formulation (noun)
a predilection for sentimentality	inventing or contriving an idea or explanation and formulating it mentally
the excessive expression of tender feelings, nostalgia, or sadness in any form	the style of expressing yourself
	a substance prepared according to a formula