As verbs the difference between passenger and embark

is that passenger is to ride as a passenger in a vehicle while embark is to get on a boat or ship or (outside the USA) an aeroplane.

As a noun passenger

is one who rides or travels in a vehicle, but who does not operate it and is not a member of the crew.

As nouns the difference between curd and custard

is that curd is the part of milk that coagulates when it sours or is treated with enzymes; used to make cottage cheese while custard is a type of sauce made from milk and eggs (and usually sugar, and sometimes vanilla or other flavourings) and thickened by heat, served hot poured over desserts, as a filling for some pies and cakes, or cold and solidified; also used as a base for some savoury dishes, such as quiches.

As a verb curd

is to form curd; to curdle.

As nouns the difference between humdrum and bore

is that humdrum is the quality of lacking variety or excitement; dullness while bore is farmer.

As an adjective humdrum

is lacking variety or excitement; dull; boring.

As a proper noun judge

is .

As an adjective impartial is

treating all parties, rivals, or disputants equally; not partial; not biased; fair.

As adjectives the difference between sullen and docile

is that sullen is having a brooding ill temper; sulky while docile is yielding to control or supervision, direction, or management.

As a noun sullen

is (obsolete) one who is solitary, or lives alone; a hermit.

As nouns the difference between onus and impetus

is that onus is a legal obligation while impetus is something that impels, a stimulating factor.

As adjectives the difference between antiviral and antiretroviral

is that antiviral is inhibiting the growth and reproduction of a virus while antiretroviral is that combats infection by retroviruses.

As a noun antiretroviral is

an agent that combats retroviruses.

As nouns the difference between cohort and generation

is that cohort is a group of people supporting the same thing or person while generation is the fact of creating something, or bringing something into being; production, creation.

Natism is likely misspelled.

Natism has no English definition.

As a noun tropism is

the turning of an organism in response to a stimulus, either towards or away from the stimulus.

As nouns the difference between health and safety

is that health is the state of being free from physical or psychological disease, illness, or malfunction; wellness while safety is the condition or feeling of being safe; security; certainty.