As an adjective duty

is hollow (having an empty space inside).

As a proper noun labor is

(australia|informal) the.

As a verb undergo

is (obsolete) to go or move under or beneath.

As a symbol res is

(label) (l).

As an adjective quintuple

is quintuple (having five parts or members).

As a noun quintet is

(music) a composition (a type of chamber music) in five parts (typically each a singer or instrumentalist, sometimes several musicians).

As nouns the difference between stairwell and shed

is that stairwell is a shaft in a multi-story building enclosing a stairway or staircase while shed is (weaving) an area between upper and lower warp yarns through which the weft is woven or shed can be a slight or temporary structure built to shade or shelter something; a structure usually open in front; an outbuilding; a hut.

As a verb shed is

(transitive|obsolete|uk|dialect) to part or divide.

In intransitive terms the difference between wave and flow

is that wave is to have an undulating or wavy form while flow is to discharge excessive blood from the uterus.

In transitive terms the difference between wave and flow

is that wave is to signal (someone or something) with a waving movement while flow is to cover with varnish.

As adjectives the difference between inert and tacit

is that inert is unable to move or act; inanimate while tacit is expressed in silence; implied, but not made explicit; silent.

As a noun inert

is (chemistry) a substance that does not react chemically.

As nouns the difference between associate and regard

is that associate is (slang) an associate's degree while regard is a steady look, a gaze.

As a verb regard is

(obsolete) to set store by (something), to hold (someone) in esteem; to consider to have value, to respect.

As proper nouns the difference between hannah and ned

is that hannah is mother of the prophet Samuel in the Old Testament while Ned is a medieval diminutive of the male given name Edward.

As a noun ned is

a person, usually a youth, of low social standing and education, a violent disposition and with a particular style of dress (typically sportswear or Burberry), speech and behaviour.

As an initialism NED is

new English Dictionary.

As nouns the difference between custodian and chaperon

is that custodian is a person entrusted with the custody or care of something or someone; a caretaker or keeper while chaperon is an adult who accompanies or supervises one or more young, unmarried men or women during social occasions, usually with the specific intent of preventing some types of social or sexual interactions or illegal behavior.

As a verb chaperon is

to accompany, to escort.

As nouns the difference between accidents and emergencies

is that accidents is while emergencies is .