Certified is a related term of expert.

As a verb certified

is (certify).

As a noun expert is

(label) rate assessor.

As nouns the difference between provocation and attraction

is that provocation is the act of provoking, inciting or annoying someone into doing something while attraction is the tendency to attract.

Failing is a related term of shortcoming.

As nouns the difference between failing and shortcoming

is that failing is weakness; defect while shortcoming is deficiency.

As a verb failing

is .

As a preposition failing

is if the preferred or prior option is not possible.

Word is a related term of scandal.

As nouns the difference between word and scandal

is that word is scripture; the bible while scandal is an incident or event that disgraces or damages the reputation of the persons or organization involved.

As a verb scandal is

(obsolete) to treat opprobriously; to defame; to slander.

Devote is a related term of employ.

As an adjective devote

is .

As a noun employ is

the state of being an employee; employment.

As a verb employ is

to hire (somebody for work or a job).

Overlay is a related term of encase.

As verbs the difference between overlay and encase

is that overlay is to lay, or spread, something over or across; to cover while encase is to enclose, as in a case.

As a noun overlay

is (printing) a piece of paper pasted upon the tympan sheet to improve the impression by making it stronger at a particular place.

Relevant is a related term of adaptable.

As adjectives the difference between relevant and adaptable

is that relevant is directly related, connected, or pertinent to a topic while adaptable is capable of adapting or of being adapted.

Big is a related term of many.

As nouns the difference between big and many

is that big is a biological insulation garment; an air-tight, full-body suit intended to prevent the spread of contaminants while many is a multitude; a great aggregate; a mass of people; the generality; the common herd.

As a determiner many is

an indefinite large number of.

As a pronoun many is

a collective mass of people.

Indecorous is a related term of peculiar.

As adjectives the difference between indecorous and peculiar

is that indecorous is improper, immodest or indecent while peculiar is out of the ordinary; odd; curious; unusual.

As a noun peculiar is

that which is peculiar; a sole or exclusive property; a prerogative; a characteristic.

As nouns the difference between irritation and excitation

is that irritation is the act of irritating, or exciting, or the state of being irritated; excitement; stimulation, usually of an undue and uncomfortable kind; especially, excitement of anger or passion; provocation; annoyance; anger while excitation is the act of exciting or putting in motion; the act of rousing up or awakening.