Correct spelling: hardy and hearty are both correct English words. The choice between them depends on the context and the meaning you want to convey. Hardy is an adjective that typically describes something or someone robust, strong, and capable of withstanding difficult or challenging conditions. It is often used to describe physical or mental toughness. Hearty is also an adjective, but it is used to describe something that is warm, sincere, enthusiastic, or substantial. It is often associated with a sense of well-being or enthusiasm.

Definition of hardy:
adjective, capable of enduring difficult conditions; robust
The hardy mountain goats are known for their ability to thrive in the harsh conditions of the alpine wilderness.
Despite the extreme cold, the hardy group of explorers pressed on with their expedition into the Arctic tundra.

Collocations with hardy:
Some most commonly used collocations include:
1. Hardy plants: plants that are able to withstand harsh weather conditions, such as cold temperatures or droughts.
These hardy plants can survive even in the harshest of climates.
2. Hardy breed: refers to a specific type or breed of animal known for its ability to endure difficult environmental conditions.
The Scottish Highland cattle is a hardy breed that thrives in rugged terrain.
3. Hardy perennial: used in gardening, it describes perennial plants that are resilient and can survive through multiple growing seasons.
These hardy perennials will bloom year after year without much care.
4. Hardy stock: refers to individuals or families known for their resilience and ability to endure hardships.
The pioneers who settled in this region were hardy stock, carving out a life in the wilderness.

Correct spelling, explanation: hardy and hearty are similar-sounding words, but they have different meanings and are used in different contexts. The first one is related to toughness and resilience, while the second one is related to warmth, enthusiasm, and substantialness. Hearty and hardy are easily confused adjectives – they are also homophones, which means that they sound the same when spoken, even though they have different meanings and spellings. Be careful not to confuse them – in the sake of clear communication.