🔹 Deadjectival Nouns Ending in -or

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The suffix -or is the only Spanish suffix that forms masculine quality nouns. Unlike -ura, -eza, or -idad, it's essentially no longer productive for forming new words from adjectives today — nearly all the surviving words are inherited from Latin or already lexicalized, with very few modern exceptions (like agrior, used in the Río de la Plata region and some parts of Spain).

#	Spanish Noun	Noun in English	Base Adjective	Base Adjective in English
1	grosor	thickness	grueso	thick
2	espesor	thickness; density	espeso	thick; dense
3	verdor	greenness; lushness	verde	green
4	dulzor	sweetness	dulce	sweet
5	frescor	freshness; coolness	fresco	fresh; cool
6	amargor	bitterness	amargo	bitter
7	largor	length	largo	long
8	grandor	greatness; large size	grande	large; great
9	blancor	whiteness	blanco	white
10	negror	blackness; darkness	negro	black
11	agrior	sourness; acidity	agrio	sour; acidic
12	agror	sourness; acidity (rare)	agrio	sour; acidic
13	albor	whiteness; dawn	albo	white
14	altor	height (archaic)	alto	high; tall
15	tristor	sadness (archaic/very rare)	triste	sad

Important morphophonological details:

-or often competes with -ura, with meanings that tend to diverge: amargor (physical taste) vs. amargura (abstract feeling); dulzor (physical taste, especially in Spain) vs. dulzura (abstract quality, and in Latin America also physical); frescor (physical property) vs. frescura (which can also mean 'cheekiness').
agrior (from agrio) is one of the few modern formations: it's used in Argentina and some regions of Spain; the older agror is little used today.
altor and tristor are archaic or very rarely used today.
Words like calor, dolor, temor, ardor, fervor, and resplandor are not included in this chart: although they end in -or, they aren't formed from a modern Spanish adjective (temor and resplandor, for instance, come from verbs: temer 'to fear', resplandecer 'to shine').

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