treacle vs sentimentalism

treacle and sentimentalism both are nouns.

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

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

treacle: writing or music that is excessively sweet and sentimental
sentimentalism: the excessive expression of tender feelings, nostalgia, or sadness in any form

treacle (noun)	sentimentalism (noun)
writing or music that is excessively sweet and sentimental	a predilection for sentimentality
a pale cane syrup	the excessive expression of tender feelings, nostalgia, or sadness in any form