imperiled

As an adjective imperiled

is (biological conservation) at risk of becoming extinct.

As a verb imperiled

is (imperil).

As a noun peril is

peril, danger.

As adjectives the difference between imperiled and endangered

is that imperiled is biological conservation at risk of becoming extinct while endangered is in danger, at risk, said of something where there is a strong possibility something bad will happen to it (for example, a species in danger of going extinct.

As verbs the difference between imperiled and endangered

is that imperiled is past tense of imperil while endangered is past tense of endanger.

As verbs the difference between imperiled and emperiled

is that imperiled is (imperil) while emperiled is (emperil).

As an adjective imperiled

is (biological conservation) at risk of becoming extinct.