The term 'sturdy tree' can be represented by two crossword solutions: ELM and OAK. Both ELM and OAK are deciduous trees that are known for their strength and durability. ELMs are a type of tree that are native to Europe, Asia, and North America, while OAKs are native to the Northern Hemisphere. Both ELMs and OAKs are popular choices for landscaping and are often used in parks and gardens. They are also popular for use in furniture and construction due to their strength and durability.