In obsolete terms the difference between child and both

is that child is a female infant; a girl while both is each of more than two.

As a noun child

is a daughter or son; an offspring.

As a determiner both is

each of the two; one and the other.

As a conjunction both is

including both (used with and.

As nouns the difference between vein and valve

is that vein is while valve is a device that controls the flow of a gas or fluid through a pipe.

As a verb valve is

to control (flow) by means of a valve.

As a noun tact

is the sense of touch; feeling.

As a verb tact

is (psychology) to use a tact (a kind of verbal operant; see noun sense).

As a proper noun slick is

a term of address, generally applied to males, possibly including strangers, implying that the person addressed is slick in the sense of "sophisticated", but often used sarcastically.

As verbs the difference between creased and furrow

is that creased is past tense of crease while furrow is to make (a) groove, a cut(s) in (the ground etc.).

As an adjective creased

is having a crease or creases.

As a noun furrow is

a trench cut in the soil, as when plowed in order to plant a crop.

As adjectives the difference between caring and lonely

is that caring is (of a person) kind, sensitive, empathetic while lonely is unhappy because of feelings of loneliness.

As a verb caring

is .

As a noun caring

is the act of one who cares.

As nouns the difference between highways and railway

is that highways is while railway is a track, consisting of parallel rails, over which wheeled vehicles such as trains may travel.

As nouns the difference between highways and track

is that highways is while track is a mark left by something that has passed along; as, the track, or wake, of a ship; the track of a meteor; the track of a sled or a wheel.

As a verb track is

to observe the (measured) state of an object over time.

As verbs the difference between plea and conjure

is that plea is to fold, fold up, double while conjure is .

As nouns the difference between debate and gossip

is that debate is (obsolete) strife, discord while gossip is someone who likes to talk about someone else’s private or personal business.

As verbs the difference between debate and gossip

is that debate is (ambitransitive) to participate in a debate; to dispute, argue, especially in a public arena while gossip is to talk about someone else's private or personal business, especially in a way that spreads the information.

As nouns the difference between debate and fossil

is that debate is (obsolete) strife, discord while fossil is fossil.

As a verb debate

is (ambitransitive) to participate in a debate; to dispute, argue, especially in a public arena.