There are several synonyms for the word "lairing" which can be used depending on the context of the sentence. "Nesting" is a synonym which refers to animals or birds building a shelter to lay eggs or rear young. "Burrowing" is also a synonym used for animals creating a hole or tunnel to live in. "Hibernating" is another synonym which describes animals sleeping during winter months for a longer period. Additionally, "lounging" is a synonym which describes relaxing, sitting or lying down for long periods, usually in a comfortable or indulgent way. Depending on the context, any of these synonyms can be used instead of "lairing" to make a sentence more engaging or precise.