In this lesson, you will learn the general rules of pluralization. Since these lessons are geared towards a grammatical structure, there is no basic nouns vocabulary section. Well, not yet anyways. However, word translations will be provided in the hopes that you will learn these words in the best way possible - by seeing them in action.
Before we start into the plurals, let me first introduce the basic categories of Romanian words. They are as follows:

You will see nouns and adjectives grouped into these categories. As you see more and more words, you will pick up on certain patterns.
(Example pattern that you probably wouldn't know yet: Neuter nouns are like the masculine in the singular, but like feminine in the plural.)

That said, let's move into plurals.

Masculine

In some cases this will cause the final consonant to change.

copil	child
copii	children
acrobat	acrobat
acrobaţi	acrobats

And words that end in a vowel have that vowel replaced by -i.

litru	liter
litri	liters
fiu	son
fii	sons

Feminine

Feminine nouns are a little more diverse in their forms.

Those ending in -ă form the plural by substituting an -e or an -i.

oră	hour
ore	hours
gară	station
gări	stations

Those ending in -e, replace it with an -i:

carte	book
cărţi	books

Those ending in -ură, replace it with -uri :

prăjitură	pastry
prăjituri	pastries

Those ending in -ie, replace it with -ii :

staţie	bus/underground stop
staţii	bus/underground stops

Those ending in -ea, replace it with -ele :

cafea	coffee
cafele	cups of coffee

Neuter

Neuter nouns have two forms in the plural.

Those ending in -ou , form the plural by adding -uri :

birou	desk
birouri	desks

Those ending in -iu , replace with -ii :

fotoliu	armchair
fotolii	armchairs