sentimentalism vs sloppiness

sentimentalism and sloppiness both are nouns.

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

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

Other hypernyms of sentimentalism include drippiness, mawkishness, mushiness, sentimentality, soupiness.

sentimentalism (noun)	sloppiness (noun)
a predilection for sentimentality	the quality of not being careful or taking pains
the excessive expression of tender feelings, nostalgia, or sadness in any form	falsely emotional in a maudlin way
	a lack of order and tidiness; not cared for
	the wetness of ground that is covered or soaked with water