ty dirty 髒, 污穢的 [Card #25; 字卡第25張: 第6個單字, 字母組合發音 ty]

• twenty, thirty, forty, fifty, sixty, seventy, eighty, ninety（20~90， 十的倍數）
• nasty, cavity, parity, charity, majesty, faculty, laity, quality, quantity, party, warranty, entity, empty, plenty, deputy, levity, treaty, realty, city, pity, liberty, affinity, facility, utility, electricity, velocity, property, county, community, university, beauty

suffix -ty (state of, quality of):
vanity, sanity, capacity, tenacity, clarity, popularity, regularity, familiarity, gravity, morality, personality, functionality, totality, mentality, vitality, finality, nationality, frugality, reality, individuality, spirituality, formality, humanity, hospitality, safety, frailty, falsity, penalty, equality, equity, inequity, specialty, brevity, authenticity, celebrity, severity, sincerity, prosperity, complexity, intensity, immensity, integrity, necessity, density, obesity, spontaneity, validity, stupidity, ability, inability, capability, stability, instability, sensibility, credibility, flexibility, eligibility, legibility, visibility, liability, reliability, feasibility, readability, possibility, probability, responsibility, compatibility, accountability, availability, predictability, unpredictability, sustainability, durability, activity, inactivity, captivity, sensitivity, negativity, relativity, objectivity, subjectivity, creativity, productivity, naivety, agility, civility, difficulty, dignity, thrifty, simplicity, toxicity, publicity, humidity, humility, infinity, vicinity, ubiquity, anxiety, society, variety, entirety, notoriety, propriety, nicety, honesty, novelty, modesty, poverty, mediocrity, generosity, curiosity, loyalty, royalty, authority, priority, majority, minority, cruelty, surety, unity, immunity, purity, security, maturity, opportunity, continuity, obscurity, dirty, thirsty, certainty, uncertainty, eternity, diversity, adversity