Here is a list of nouns that start with PER.

percent, percentage, perception, percolator, percussion

perfectability, perfectibility, perfection, perfectionism, performance

performer, perfume, perfumery, perfusion, peril

perilla, perimeter, period, periodical, periodicity

periphery, perjury, permanence, permissibility, permission

permit, peroxide, perpetration, perpetrator, perpetuation

perplexity, persecution, perseverance, persiflage, persistence

persistent, person, persona, personae, personage

personality, personification, personnel, perspective, perspiration

persuading, persuasion, pertinence, perturbation, perusal

pervaporation

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