# Rhyming doubles for things in general in Vietnamese

> Some nouns come with an echoing second half that has no meaning of its own: cây cối (trees and plants), máy móc (machinery), bạn bè (friends), đường sá…

Source: https://vietnamesebuddy.com/grammar/redup-collective/ · Updated 2026-10-17

**… and the like**

Pattern: `[noun] + [rhyming copy] (cây cối, máy móc)`

Level: B2 (our estimate) · Register: everyday

Some nouns come with an echoing second half that has no meaning of its own: *cây cối* (trees and plants), *máy móc* (machinery), *bạn bè* (friends), *đường sá* (roads), *chim chóc* (birds). The pair means the whole category, things of that kind in general, a bit like English "greenery" next to "plant".

The second half only exists inside the pair: *cối* in *cây cối* and *móc* in *máy móc* add nothing you could translate. That's what sets them apart from pair words like *quần áo* (clothes, from trousers + tops), where both halves are real words.

Because they mean a whole category, you can't count them. Don't put a number or a classifier in front: not *hai cây cối* but *hai cái cây* or *hai chậu cây* (two pots of plants). To talk about one, use the plain noun.

They're ordinary everyday words, and *bạn bè* is one of the most common words in the language. A few carry a colour of their own: *giấy má* (paperwork) usually comes with a sigh.

Don't confuse them with a doubled adjective like *đo đỏ* (reddish), which softens a quality rather than gathering things into a group.

## A common mistake

✗ Em mới mua hai cây cối cho ban công.

✓ Em mới mua hai chậu cây cho ban công.

*Cây cối* means trees and plants in general, so it can't be counted. To count, use the plain noun with a classifier or a container: *hai chậu cây*.

## Examples

- Nhà ông bà ngoại ở quê có nhiều cây cối lắm. — My grandparents' place in the countryside has lots of trees and plants.
- Bạn bè em ai cũng lập gia đình hết rồi. — All my friends have got married now.
- Máy móc trong xưởng này cũ quá rồi. — The machinery in this workshop is really old now.
- Đường sá ở đây mới làm lại, chạy xe êm lắm. — The roads here have just been redone, it's a really smooth ride.
- Giấy má rắc rối quá, em làm cả tuần chưa xong. — The paperwork is such a hassle, I've been at it all week and it's still not done.

## Compare

- [Pair words mean things in general: quần áo, bàn ghế](https://vietnamesebuddy.com/grammar/paired-compound-collective/): collective pairs
- [Doubling softens: đo đỏ, xanh xanh (-ish)](https://vietnamesebuddy.com/grammar/redup-ish/): -ish, a little

Previous in How words are built: [New, former, great before the noun: tân, cựu, đại](https://vietnamesebuddy.com/grammar/sino-adj-before/)
Next in How words are built: [The quality of: tính + word (tính khả thi)](https://vietnamesebuddy.com/grammar/tinh-ity/)

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