Tree line or treeline?
tree line is a noun meaning “The edge of the habitat at which trees are capable of growing; the timberline”; treeline is a noun meaning “Alternative spelling of tree line”. Wiktionary gives them as spellings of the same word. tree line is written as two words and treeline as one word; they are used differently.
What is the difference between tree line and treeline?
| tree line | treeline | |
|---|---|---|
| Part of speech | noun | noun |
| Meaning | The edge of the habitat at which trees are capable of growing; the timberline A division in altitude (or latitude) above which trees tend not to grow on mountains | Alternative spelling of tree line |
| Example | none recorded | none recorded |
| Forms | tree-lines | treelines |
| Pronunciation | not recorded | not recorded |
| In writing | not counted (the list counts single words) | about once in every 6 million words |
Sources: tree line and treeline in the English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0); written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Every current meaning of tree line and treeline
tree line
- 1
The edge of the habitat at which trees are capable of growing; the timberline
- 2
A division in altitude (or latitude) above which trees tend not to grow on mountains
treeline
- 1
Alternative spelling of tree line
Source: the English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0); obsolete, archaic, dialect and rare senses left out.
Which is more common, tree line or treeline?
tree line is a phrase, which the list of single words does not count; treeline about once in every 6 million words.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How many people search tree line vs treeline?
“tree line vs treeline” is searched about 10 times a month on Bing (Google reports it together with close variants, so it has no figure of its own) in the United States.
Sources: Google Ads keyword data through DataForSEO and Microsoft Advertising keyword data through DataForSEO, the average month from September 2025 to August 2026.