Difference between Useful and Viable

USEFUL vs VIABLE: ADJECTIVE

Capable of being turned to use or account
Being of use or service
Having a useful function
Having a beneficial use; serviceable.
Being of practical use.
Full of use, advantage, or profit; producing, or having power to produce, good; serviceable for any end or object; helpful toward advancing any purpose; beneficial; profitable; advantageous.
Having a practical or beneficial use.
Of great importance or use or service

Capable of being done with means at hand and circumstances as they are
Capable of success or continuing effectiveness; practicable: : possible.
Capable of living, developing, or germinating under favorable conditions.
Capable of living outside the uterus. Used of a fetus or newborn.
Capable of living; born alive and with such form and development of organs as to be capable of living; -- said of a newborn, or a prematurely born, infant.
Able to live on its own (as for a newborn.)
Able to be done, possible.
In (biology), able to live and develop.
Capable of life or normal growth and development

Being of use, advantage, or profit; valuable for use; suited or adapted to a purpose; producing or having power to produce good; beneficial; profitable; serviceable.
Useful invention.

Capable of living; likely to live; specifically, capable of continued existence outside of the womb: noting a fetus. Seeviability, 1.

Recyclable, Multipurpose, Reusable, Reclaimable, Utilizable, Utile, Utilitarian, Serviceable, Functional, Useable, Usable, Practical, Important, Valuable, Helpful

Sustainable, Advantageous, Plausible, Suitable, Unfeasible, Desirable, Credible, Profitable, Tenable, Unviable, Practicable, Alive, Possible, Workable, Feasible

Recyclable, Multipurpose, Reusable, Reclaimable, Utilizable, Utile, Utilitarian, Serviceable, Functional, Useable, Usable, Practical, Important, Valuable, Helpful

Sustainable, Advantageous, Plausible, Suitable, Unfeasible, Desirable, Credible, Profitable, Tenable, Unviable, Practicable, Alive, Possible, Workable, Feasible

Get useful insights to help make better decisions.
This option is only useful to Guix developers.
Three additional categories of area formulas are useful.
They identify the useful energy forms and the desired output of the device, and the forms that are not useful for the intended use.
Useful Summation Formulas We can use the notation to indicate useful formulas that we will have occasion to use.
This is useful for maintaining correct release times for software and is particularly useful in conjunction with the MKS Make software development facility.
As always, if you find this article useful then others may find it useful too.
The guide is quite useful, and has useful pictures accompanying the text.
Gems of Useful Knowledge Life hacks, practical tips and overall useful information.
Please provide examples of how they are useful or not useful.

Services to you is no longer commercially viable.
Is it viable to do Aloe vera plantation.
Charging on the go is becoming increasingly viable.
Can we build a viable life for ourselves?
Others have seen this as a viable option.
This is a viable option for medical treatment.
Coir dust, a viable alternative to peat moss.
RTI would be a viable alternative to discrepancy.
At this time, there is no viable alternative.
The Viable Infants Protection Act prohibits an abortion after twenty weeks if the physician determines that the fetus is viable.