Induction: examining a number of individuals and proposing a general judgment about their class.
Analogy: extending a known judgment from one individual to another on the basis of a relevant common feature.
Examining the leaves of many trees and inferring a pattern for the entire species is induction. Suspecting the same disease in another tree because it shares a particular symptom with a diagnosed tree is analogy.
Both need testing, but their direction of inference differs: particulars to a universal versus particular to particular.