1. The phon is a logarithmic unit of loudness level for tones and complex sounds. Loudness is measured in sones, a linear unit. Human sensitivity to sound is variable across different frequencies, so although two different tones may present an identical sound pressure to a human ear, they may be psychoacoustically perceived as differing in loudness. The purpose of the phon is to provide a logarithmic measurement (like decibels) for perceived sound magnitude, while the primary loudness standard methods result in a linear representation. A sound with a loudness of 1 sone is judged equally loud as a 1 kHz tone with a sound pressure level of 40 decibels above 20 micropascals. The phon is psychophysically matched to a reference frequency of 1 kHz. In other words, the phon matches the sound pressure level (SPL) in decibels of a similarly perceived 1 kHz pure tone. For instance, if a sound is perceived to be equal in intensity to a 1 kHz tone with an SPL of 50 dB, then it has a loudness of 50 phons... from wikipedia.org

2. (Abstract Noun) A feeling of agitation and anxiety caused by the presence or imminence of danger. বিপদৰ সন্মুখীন হোৱাৰ বাবে অথবা সম্ভাৱ্য বিপদৰ বাবে হোৱা মানসিক উত্তেজনা আৰু অস্থিৰতা।

Different POS:

a. Verb-Intran.: alarmfrightenscareterrorizeসন্ত্ৰাসিত কৰ্...
b. Verb-Trans.: appallhorrifyterrifyআতংকিত কৰ্ত্ৰাসিত কৰ...
c. Proper Adj.: afraidapprehensivefearfulstartledterrified...
d. Proper Adj.-Common: creepydreadfulfearfulfrighteningfrightful...

Related Idea:

e. Abstract Noun: panicterrorগৰ্ভ-ত্ৰাসতংকতামাকাঁহা...