nombre (nm), substantivo (nm/adj) – nombre also means ‘name’

Nouns

Nouns have gender (m or f) and may be plural (pl), with various endings.
Usually a noun ending in -o is masculine, and one ending in -a is feminine.  There are exceptions (e.g., la mano, el idioma), and there are a number of other endings for nouns:

e.g., for things:

mesa (f) – table

libro (m) – book

llave (f) – key (of door, car, etc.)

jamón (m) – ham

amor (m) – love

 
Nouns used for people or animals usually change their endings according to the gender of the person or animal:

el niño – (the boy); la niña – (the girl)

 
Plurals generally add -s if they end in a vowel, or -es otherwise (unless they already end in s):

mesas (f pl) – tables

libros (pl) – books

platos (m pl) – plates, dishes, courses

semanas (f pl) – weeks

deber (m) – duty

deberes (m pl) – homework

 
Articles to use with nouns:

un, una – a

el, la – the (also lo – it)

(+ plural versions)

 
See also pronouns and the pronouns table.