love (n.)
Old English lufu “feeling of love; romantic sexual attraction; affection; friendliness; the love of God; Love as an abstraction or personification,” from Proto-Germanic *lubo (source also of Old High German liubi “joy,” German Liebe “love;” Old Norse, Old Frisian, Dutch lof; German Lob “praise;” Old Saxon liof, Old Frisian liaf, Dutch lief, Old High German liob, German lieb, Gothic liufs “dear, beloved”). The Germanic words are from PIE root *leubh- “to care, desire, love.”
passion (n.)
c. 1200, “the sufferings of Christ on the Cross; the death of Christ,” from Old French passion “Christ’s passion, physical suffering” (10c.), from Late Latin passionem (nominative passio) “suffering, enduring,” from past-participle stem of Latin pati “to endure, undergo, experience,” a word of uncertain origin. The notion is “that which must be endured.”
In Middle English also “an ailment, disease, affliction;” also “an emotion, desire, inclination, feeling; desire to sin considered as an affliction” (mid-13c.). The specific meaning “intense or vehement emotion or desire” is attested from late 14c., from Late Latin use of passio to render Greek pathos “suffering,” also “feeling, emotion.”
blush / intensity in every possible way / warm / butterflies in the stomach / trembling / disrupted flow of thought / heart racing