* Beag: This is the most common and generally useful word for "little," applicable to size, amount, or importance. It's often used before a noun (e.g., *teach beag* - small house).
* Beagán: This means "a little" or "a small amount" and is used for uncountable nouns.
* Bog: This means "soft" or "tender," and can sometimes be used figuratively to mean "little" or "small" in a gentle or endearing way.
* Óg: This means "young," and can imply "little" when referring to a child or young animal.
To choose the best word, you need to specify what you're describing. For example:
* Little house: Teach beag
* Little bit of milk: Beagán bainne
* Little child: Leanbh beag (or páiste beag)
* Little lamb: Uainín beag (using the diminutive form of uain - lamb)
So, there's no single answer; "beag" is a good starting point, but the best word will depend on the context.