tributary - noun, a river or stream flowing into a larger river or lake.

somnolent - adjective, inclined to or heavy with sleep.

voluble - adjective, characterized by ready or rapid speech.

inexplicably - adjective, incapable of being explained, interpreted, or accounted for.

immanent - adjective, being within the limits of possible experience or knowledge.

melancholy - adjective, causing or tending to cause sadness or depression of mind or spirit.

transient - noun,  a guest or boarder who stays only briefly.

facade - noun, a false, superficial, or artificial appearance or effect.

optimist - noun, a person who is inclined to be hopeful and to expect good outcomes.

 superfluous - adjective, exceeding what is sufficient or necessary.

 Supposition - noun, an interpretation of a practical situation or condition taken as the ground for action.

 Nonchalant - adjective, having an air of easy unconcern or indifference.

 Suburb -  noun, an outlying part of a city or town.

 Jetty - noun, a structure extended into a sea, lake, or river to influence the current or tide or to protect a harbor.

 caesura - noun, a usually rhetorical break in the flow of sound in the middle of a line of verse.

 euphony - noun, pleasing or sweet sound.

 enjambment - noun, the running over of a sentence from one verse or couplet into another so that closely related words fall in different lines.

 juxtaposition - noun, the act or an instance of placing two or more things side by side often to compare or contrast or to create an interesting effect.

 headwater - noun, the source of a stream.

 archaic - adjective, of, relating to, or characteristic of an earlier or more antiquated time.

 enmity - noun, mutual hatred or ill will.

solstice - noun, either of the two points on the ecliptic at which its distance from the celestial equator is greatest and which is reached by the sun each year about June 21 and December 21.