"Seminal" refers to something that is highly influential or fundamental to the development of something else. "Rudimentary" can also be used to describe something that is basic or essential, forming the foundation of something more complex.

Similar words: Fundamental, Rudimentary, Elemental.

"Rhapsody" refers to a passionate or ecstatic expression of feeling, especially in music or poetry. "Jubilant" fits as it describes a joyful, exuberant expression.

Similar words: Ecstasy, Jubilant, Excessive happiness.

"Germane" means relevant or closely related to the subject at hand. "Relevant" is the closest synonym, meaning something that is closely connected to or appropriate for the matter.

Similar words: Pertinent, Apposite, Apt, Apropos.

"Tamper" refers to interfering with something in a way that alters or damages it, especially without permission. "Interfere" is the most appropriate synonym.

Similar words: Interfere, Meddle, Fiddle, Dabble.

A "misdemeanor" is a minor wrongdoing or offense. "Peccadillo" is a synonym, which refers to a small or minor fault or sin.

Similar words: Misconduct, Felony, Flaw, Peccadillo.

"Placid" refers to a calm and peaceful nature, often without disturbance. "Serene" is a synonym as it also refers to something calm and tranquil.

Similar words: Quiet, Calm, Serene, Sober.

"Oxidize" refers to the chemical process where a substance combines with oxygen, leading to the formation of rust, especially on metals.

Similar words: Rust, Decompose, Molding, Corrode, Disintegrate. 

"Pressing" refers to something that requires immediate attention or action. "Urgent" is the most fitting synonym because it also refers to something that demands quick attention.

Similar words: Urgent, Acute, Intense, Crucial.

"Foe" refers to an enemy or an adversary, someone who is opposed to you. "Enemy" is the most direct synonym.

Similar words: Adversary, Rival, Opposition part.

"Elegant" describes something or someone refined, graceful, and stylish, often in a sophisticated way. "Fashionable" is a synonym because it also refers to something that is in good taste and up-to-date in style.

Similar words: Fashionable, Urbane, Pretty.