As adjectives the difference between unhappy and grieve

is that unhappy is not happy; sad while grieve is .

As an adjective unhappy

is not happy; sad.

As a verb grieving is

.

As a noun grieving is

an act or instance of grieving.

As a noun wetlands is

an area or region that is characteristically saturated; a marsh.

As nouns the difference between doughnuts and donuts

is that doughnuts is plural of lang=en while donuts is plural of lang=en.

As nouns the difference between guardian and trustee

is that guardian is someone who guards, watches over, or protects while trustee is a person to whom property is legally committed in trust, to be applied either for the benefit of specified individuals, or for public uses; one who is intrusted with property for the benefit of another; also, a person in whose hands the effects of another are attached in a trustee process.

As a proper noun Guardian

is a British daily national newspaper.

As a verb trustee is

to commit (property) to the care of a trustee; as, to trustee an estate.

As verbs the difference between frustrated and overwhelmed

is that frustrated is past tense of frustrate while overwhelmed is past tense of overwhelm.

As an adjective frustrated

is foiled, stopped, disappointed.

As an adverb cat

is how much.

As an adjective cat

is how much.

As a noun mountain is

a large mass of earth and rock, rising above the common level of the earth or adjacent land, usually given by geographers as above 1000 feet in height (or 3048 metres), though such masses may still be described as hills in comparison with larger mountains.

As nouns the difference between graph and vector

is that graph is graph or graph can be a symbol as the smallest unit in a text which has not yet been classified as a grapheme while vector is (mathematics) a directed quantity, one with both magnitude and direction; the signed difference between two points.

As a verb vector is

to set (particularly an aircraft) on a course toward a selected point.

As adjectives the difference between decisive and analytical

is that decisive is having the power or quality of deciding a question or controversy; putting an end to contest or controversy; final; conclusive while analytical is of or pertaining to analysis; resolving into elements or constituent parts; as, an analytical experiment.

As nouns the difference between element and parameter

is that element is one of the simplest or essential parts or principles of which anything consists, or upon which the constitution or fundamental powers of anything are based while parameter is a variable kept constant during an experiment, calculation or similar.