en spend 花費 [Card #10; 字卡第10張: 第2個單字, 字母組合發音 en]

Some more examples(更多例字):
short e sound:
end, bend, mend, send, tend, vend, fend, defend, lend, blend, trend, den, pen, ten, men, hen, Zen, yen, when, then, Ben, Ken, gentle, mental, mention, sense, dense, condense, consensus, render, gender, engender, venture, adventure, engine, enzyme, envelope, enterprise, enter, entrance, entry, envy, entity, identity, density, plenty, frenzy, bench, clench, stench, drench, trench, appendix, append, impend, impending, intensive, extensive, comprehensive, tentative, tendency, tendon, tense, fence, sentence, expense, dispense, suspense, surrender, slender, splendor, splendid, prevent, authentic, tremendous, potential, utensil, lentil

prefix en- /ɪn-/ (usually means “cause to")
enact, enhance, enchant, entangle, encamp, encapsulate, entrap, endanger, enable, enslave, encase, encage, engage, enrage, enlarge, envelop, endear, enrich, enlist, envision, envisage, encrypt, enwind, enshrine, entice, entitle, enliven, enlighten, encircle, encompass, engross, ennoble, encode, enclose, encroach, enforce, endorse, enroll, enfold, enjoy, endow, encounter, encourage, engulf, entrust, endure, ensure

suffix -en /-ən/ ("to become" or "made of")
blacken, barren, brazen, fatten, flatten, fasten, hasten, madden, sadden, gladden, dampen, straighten, strengthen, darken, harden, sharpen, fallen, freshen, lessen, lengthen, cheapen, weaken, sweeten, deepen, bitten, hidden, forbidden, thicken, stiffen, glisten, quicken, stricken, ripen, widen, tighten, whiten, brighten, lighten, enlighten, forgotten, toughen, broken, frozen, chosen, woven, golden, soften, moisten, loosen, wooden, shorten