As nouns the difference between spicule and skeleton

is that spicule is a sharp, needle-like piece while skeleton is the system that provides support to an organism, internal and made up of bones and cartilage in vertebrates, external in some other animals.

As a verb skeleton is

to reduce to a skeleton; to skin; to skeletonize.

As nouns the difference between spicules and skeleton

is that spicules is plural of lang=en while skeleton is the system that provides support to an organism, internal and made up of bones and cartilage in vertebrates, external in some other animals.

As a verb skeleton is

to reduce to a skeleton; to skin; to skeletonize.

As a verb insure

is to provide for compensation if some specified risk occurs often agreed by policy (contract) to offer financial compensation in case of an accident, theft or other undesirable event.

As an adjective sure is

.

As verbs the difference between covered and covering

is that covered is (cover) while covering is .

As an adjective covered

is overlaid with or enclosed within something.

As a noun covering is

(countable) that which covers something.

As verbs the difference between operated and wrought

is that operated is (operate) while wrought is (work).

As adjectives the difference between operated and wrought

is that operated is (in combination) operated by the means specified eg a battery-operated toy while wrought is having been worked or prepared somehow.

As nouns the difference between guidelines and regulations

is that guidelines is while regulations is .

As nouns the difference between codeine and heroin

is that codeine is an addictive alkaloid narcotic derived from opium and used as a hypnotic, analgesic and cough suppressant; often mixed with aspirin etc while heroin is a powerful and addictive drug derived from opium producing intense euphoria classed as an illegal narcotic in most of the world.

As nouns the difference between measurand and standard

is that measurand is a quantity intended to be measured while standard is .

As nouns the difference between innovation and experiment

is that innovation is while experiment is experiment.

As nouns the difference between ships and shipping

is that ships is while shipping is the transportation of goods.

As verbs the difference between ships and shipping

is that ships is (ship) while shipping is .