As nouns the difference between timberline and timberling
is that timberline is the height or limit beyond which trees do not grow in mountainous or arctic regions while timberling is (uk|dialect|dated) a small tree.
timberline
English
Alternative forms
* timber line
Noun
(
en noun)
The height or limit beyond which trees do not grow in mountainous or arctic regions.
Synonyms
* tree line